To have a serious disagreement with someone that damages the relationship.
To have a serious argument or disagreement with someone that causes damage to your relationship with them. After falling out, people often stop speaking to each other for a period of time.
Type
Inseparable
Collocations
fall out with someone — have a serious disagreement
fall out over something — argue about a specific issue
his hair started to fall out — the unrelated literal sense
⚠️ Watch out
Mainly a British usage for arguments; in American English, 'fall out' is more associated with the literal or military sense (e.g. 'nuclear fallout').
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In the early 1840s, Abraham Lincoln and James Shields were both rising political figures in Illinois — but their relationship collapsed dramatically and nearly fatally. In 1842, Lincoln published a series of anonymous satirical letters in the Sangamo Journal {{mocking|verb-various-tenses|medium}} Shields, then the Illinois State Auditor, as {{vain|adjective|hard}}, incompetent, and dishonest. When Shields discovered Lincoln was the author, he was furious and demanded a formal apology. Lincoln refused to give one he considered {{adequate|adjective|medium}}, and Shields challenged him to a duel. The two men actually traveled to an island on the Missouri River — Sunflower Island — on September 22, 1842, prepared to fight with cavalry broadswords. {{Only|connective|medium}} last-minute mediation by their seconds {{prevented|verb-various-tenses|easy}} bloodshed. The affair {{deeply|adjective|easy}} embarrassed Lincoln, who rarely spoke of it afterward, and the two men maintained a {{frosty|adjective|hard}} distance for years. {{Indeed|connective|hard}}, it is a vivid historical reminder of how thoroughly two people can {{fall out|phrasal-verb|medium}} — and how a disagreement, left without genuine repair, can {{escalate|verb-various-tenses|hard}} far beyond its original cause.
To argue or disagree means to have a serious difference of opinion with someone that causes tension or damages the relationship between them. It suggests a conflict that goes beyond mild difference and leaves a lasting impact on how two people relate to each other.
Type
Intransitive verb / verb phrase (argue); intransitive verb (disagree)
Collocations
argue over something — used when the subject of the conflict is specified (e.g. argue over money)
argue with someone — indicates the other party involved in the conflict
disagree strongly — adverb intensifier common in neutral and journalistic writing
begin to argue — collocates with temporal markers to show the onset of conflict
disagree on something — used when specifying the topic of disagreement (e.g. disagree on strategy)
⚠️ Watch out
Be careful not to use 'argue' in contexts where a mild difference of opinion is meant, as it implies a more serious and emotionally charged conflict. In neutral writing, 'disagree' is the safer choice when the tone needs to remain measured or professional.
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Priya and Joel had worked together for three years without a single serious problem. Then a disagreement over how to handle a difficult client changed everything. They began to argue in team meetings — calmly at first, then with an edge that everyone else in the room could feel. By the end of the quarter, they were communicating only by email. Their manager arranged a mediation session, but it was clear both parties had dug in. When people argue and let it fester, the damage compounds. Priya eventually requested a transfer to a different team. Joel stayed, but the easy camaraderie they'd once shared was gone.
The Science of Friendship Breakdown
For decades, psychologists have studied why relationships end — romantic ones especially. But a quieter area of research is gaining ground: why long-term friendships collapse, and what, if anything, can save them.
Dr. Lena Marsh, a social psychologist at the University of Edinburgh, has spent the last eight years tracking friendship durability across different age groups. Her findings suggest that the friendships most likely to survive are not those where people never argue, but those where conflict is addressed quickly and honestly.
'People tend to think that if you disagree with a close friend over something significant, it means the friendship was fragile to begin with,' Marsh explains. 'But that's not what the data shows. It's the avoidance of repair — the failure to reconnect after the conflict — that does the real damage.'
Her research points to a critical window of roughly 72 hours after a serious disagreement. Friendships in which one person reached out within that period were significantly more likely to recover fully. Those that passed the three-day mark without contact entered what Marsh calls a 'hardening phase,' where assumptions replace communication and both parties begin quietly rewriting the history of the relationship.
The implications are straightforward, if not always easy to act on: when you argue with someone you value, the clock starts immediately.
To 'have a dispute' in a work context means to become involved in a serious disagreement with a colleague, client, or partner that causes lasting damage to a professional relationship. It implies a formal or significant conflict, often one that requires intervention or resolution procedures.
Type
Verb phrase
Collocations
have a dispute over something — used when specifying the subject of the conflict (e.g. budget, territory)
have a dispute with someone — used to identify the other party involved
have a dispute regarding — formal variant common in legal and contractual language
resolve a dispute — natural follow-on collocation in formal writing
arising from a dispute — frequently used in contracts and legal correspondence
⚠️ Watch out
Avoid using 'have a dispute' in casual internal messages or team chats, as it can sound unnecessarily formal and may escalate the perceived severity of a minor disagreement. Ensure the preposition following the phrase is appropriate to context: 'over' for subject matter, 'with' for the opposing party, and 'regarding' in legal or contractual settings.
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When Priya joined the consultancy, she quickly noticed tension between two senior analysts. They had had a dispute over credit for a major client report, and the atmosphere in the team had never fully recovered. Meetings were strained, emails were clipped, and collaboration had slowed to a minimum. Their line manager eventually stepped in and arranged a structured conversation with HR present. It became clear that both analysts felt overlooked and undervalued. Once they acknowledged how damaging it had been to have a dispute of that nature, they agreed to establish clearer working protocols. The team dynamic gradually improved over the following month.
Meridian Consulting had built its reputation on seamless client relationships and efficient internal processes. For over a decade, the firm had navigated competitive pressures without any significant breakdown in its leadership structure. That changed in the spring, when the firm's two founding partners — David Lau and Caroline Ferris — began to have a dispute over the strategic direction of the business. David believed the firm should expand into Southeast Asian markets, while Caroline was firmly committed to consolidating their position in Europe. What began as a difference of professional opinion quickly became entrenched. Emails grew formal and guarded. Joint client presentations were quietly reassigned to avoid the need for the two to appear together. Junior staff noticed the shift in atmosphere and productivity across several teams began to dip.
The board convened an emergency session in May and appointed an independent mediator. In the briefing document prepared for that session, it was noted that allowing senior leaders to have a dispute of this duration without intervention had caused measurable damage to staff morale and client confidence. The mediation process took three weeks, but ultimately produced a written agreement that clearly defined each partner's strategic responsibilities going forward. Meridian emerged from the experience with stronger governance structures and a renewed commitment to internal communication.
To 'experience interpersonal conflict' in academic English means to undergo a serious disagreement or rupture in a relationship that results in lasting damage to the social or professional bond between the parties involved. The expression is used in scholarly contexts to describe relational deterioration arising from incompatible goals, values, or behaviours.
Type
Verb phrase (intransitive in construction; 'experience' functions as main verb + noun phrase object)
Collocations
experience interpersonal conflict with — indicates the other party involved, e.g. 'with a supervisor'
experience interpersonal conflict during — specifies a temporal or situational context, e.g. 'during peer review'
experience interpersonal conflict over — signals the source of disagreement, e.g. 'over authorship attribution'
more likely to experience interpersonal conflict — common probabilistic framing used in quantitative findings
experience severe/significant interpersonal conflict — adjectival modification to indicate intensity, appropriate in results sections
⚠️ Watch out
In academic writing, avoid nominalising this phrase redundantly, as in 'the experiencing of interpersonal conflict', which is stylistically awkward; instead, prefer 'when interpersonal conflict is experienced' or rephrase using the active verb form. Additionally, ensure that 'experience interpersonal conflict' is reserved for relational rupture with lasting consequences, and is not used loosely to describe minor disagreements, which would undermine its precision in a scholarly context.
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Dr Harlow had always considered her collaboration with Professor Vane to be one of the most intellectually rewarding of her career. They had co-authored three well-cited papers and shared a research grant without difficulty. However, midway through their fourth project, they began to experience interpersonal conflict over the framing of the central argument — a dispute that deepened as the submission deadline approached. By the time the manuscript was submitted, neither had spoken to the other in weeks. Colleagues observed the rupture with concern. It was not the first time two researchers of such calibre had come to experience interpersonal conflict under the pressures of competitive publication, but it was, for both of them, unexpectedly painful.
The sociology of scientific knowledge has long acknowledged that research is a fundamentally social enterprise, shaped not only by data and method but by the quality of the relationships that sustain collaborative inquiry. Yet despite growing interest in team science and co-authorship networks, the relational dimension of academic work remains undertheorised — particularly with respect to conflict. When researchers experience interpersonal conflict within established partnerships, the consequences extend well beyond the immediate emotional register. Publication trajectories are disrupted, grant consortia fragment, and institutional reputations are, in some cases, irreparably affected. These outcomes suggest that relational breakdown in academic contexts is not merely a personal matter but a structural one, with measurable implications for the production and dissemination of knowledge.
What is less well understood is why certain collaborative dyads prove more vulnerable to relational rupture than others. Existing frameworks drawn from organisational psychology offer partial explanations — role ambiguity, resource scarcity, and status differentials are consistently implicated — but they rarely account for the disciplinary cultures and epistemic values that shape how academics negotiate disagreement. It may be that researchers are more likely to experience interpersonal conflict precisely when their deepest intellectual commitments are at stake, rendering conventional conflict-resolution strategies insufficient. Future scholarship would benefit from longitudinal designs capable of tracing relational trajectories from initial collaboration through to breakdown, illuminating the often invisible processes by which productive partnerships unravel.