To use all of something so that nothing is left; to have no more of something.
To use all of something so that there is none left; to have no more of something available. When you run out of something, you have used or consumed the last of it.
Type
Inseparable
Collocations
run out of time — have no time left
run out of milk — have none of something left
time is running out — a common continuous-tense usage
⚠️ Watch out
Always followed by 'of' + the thing that has been depleted — don't drop the preposition (not 'we ran out milk').
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In August 1914, the British Expeditionary Force {{retreated|verb-various-tenses|easy}} from Mons, Belgium, after holding against {{overwhelming|adjective|hard}} German forces. By the time units reached Le Cateau, many soldiers had run critically low on ammunition — some battalions had fired over 400 rounds per man in a single day. At the Battle of Le Cateau on August 26th, General Sir Horace Smith-Dorrien made the {{controversial|adjective|medium}} decision to turn and fight rather than continue retreating, partly because exhausted troops could not outrun the enemy, and partly because supply lines had broken down so severely that some units had effectively exhausted their reserves. The battle cost the British nearly 8,000 casualties {{but|connective|easy}} {{bought|verb-various-tenses|medium}} precious time for the main retreat to continue. Military historians point to this episode as a {{stark|adjective|easy}} example of how running out of essential supplies — ammunition, food, rest — forces commanders into decisions they would never otherwise make. {{The moment|connective|hard}} a resource {{runs out|phrasal-verb|medium}} in the field, options collapse rapidly.
To deplete or exhaust something means to use all of it until none remains. These verbs describe the process of consuming a resource, supply, or reserve completely.
Type
Transitive verb
Collocations
deplete reserves — used when describing the using up of stored supplies or funds
exhaust resources — common in journalism and reports to describe total consumption of available assets
deplete stocks — frequently appears in supply chain, retail, and logistics contexts
exhaust supplies — natural in emergency, travel, and medical contexts
rapidly deplete — adverb pairing used to emphasize speed of consumption
⚠️ Watch out
Both 'deplete' and 'exhaust' require a direct object — you must deplete or exhaust something specific. Avoid using them without a clear noun following, as in 'we depleted' with no object, which sounds incomplete and unnatural in any register.
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Carla had packed carefully for the five-day hiking trail, but the unexpected heat began depleting her water supply by the second afternoon. She rationed carefully, but by day three, she had exhausted the last of her bottles and was relying entirely on a purification tablet and a narrow stream she had spotted on the map. It wasn't the adventure she had imagined. Back at the trailhead, she told the ranger that the route markers underestimated the distance between water sources, and that the heat alone could deplete a standard three-liter supply in under six hours. The ranger nodded and made a note.
When the Fuel Gauge Hits Zero: A Lesson in Preparedness
It happened on a Tuesday afternoon on a quiet stretch of highway outside of Flagstaff. The rental car's warning light had been on for about twenty minutes when Marcus finally accepted that he had, against his better judgment, depleted the tank almost completely while searching for an open gas station in unfamiliar territory.
He pulled over onto a wide gravel shoulder and sat with the windows down, listening to the wind move through the scrub brush. The nearest town was eleven miles back. His phone showed two bars of signal — enough to call for roadside assistance, which he did, but the wait time was over an hour.
What struck him most, he later wrote in his travel journal, wasn't the inconvenience. It was how quickly a situation could shift from comfortable to precarious. One poor decision — skipping a half-full station an hour earlier because he assumed something better was ahead — had exhausted his options entirely, leaving him dependent on strangers and luck.
The tow truck arrived seventy minutes later. The driver was cheerful and unhurried, and by evening Marcus was back on the road. But the lesson stayed with him long after the trip ended: complacency has a cost, and it often arrives without warning.
To 'exhaust the supply of' something in a work context means to use up the entire available stock or quantity of a resource, material, or commodity, leaving none remaining. It is used when an organisation or process has consumed everything that was available.
Type
Transitive verb phrase
Collocations
exhaust the supply of raw materials — used in manufacturing and procurement contexts when physical stock is fully depleted
exhaust the supply of funds / budget — used in financial reporting to indicate that a financial reserve has been entirely consumed
exhaust the supply of components / parts — common in engineering and operations management when assembly materials are used up
nearly / almost exhaust the supply of — a frequent hedging pattern used before an item is completely depleted, often to trigger reordering
risk exhausting the supply of — used in risk assessments and forecasting to flag potential future depletion
⚠️ Watch out
Although 'exhaust the supply of' is precise and professional, it can sound overly formal in short internal messages or quick spoken updates, where a simpler construction may communicate more efficiently. Avoid redundancy by not combining it with a further synonym, for example writing 'completely exhaust the entire supply of' is unnecessarily wordy and weakens the professional tone.
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When Priya joined the events team, she assumed inventory management looked after itself. It did not. Three days before the annual client conference, a colleague quietly mentioned that the team had nearly exhausted the supply of branded gift sets — the very items guests expected on arrival. Priya escalated immediately, contacted the supplier, and negotiated an expedited production run at a premium cost. The sets arrived the evening before the event. From that point on, Priya introduced a monthly stock audit. She refused to allow the team to exhaust the supply of any conference essential ever again, and her colleagues were quietly grateful for it.
The quarterly operations review at Kestrel Manufacturing had, by all accounts, gone smoothly — until the final agenda item. The supply chain lead, Daniel Forsythe, presented a slide that drew the room into an uncomfortable silence. According to warehouse records, the Sheffield facility had come within forty-eight hours of exhausting the supply of the specialised resin used in the firm's flagship insulation product. A delayed shipment from the European supplier, compounded by a forecasting error in the demand model, had nearly brought production to a standstill. The financial exposure, Daniel noted carefully, would have exceeded three hundred thousand pounds in lost output.
The board listened without interruption. When he finished, the operations director asked a single question: how had the threshold been missed? The answer was uncomfortable — the reorder alert had been set too low and had not been reviewed in over eighteen months. A working group was established before the meeting ended, tasked with auditing every critical material to ensure the company would never again risk exhausting the supply of an input essential to core production. The mood leaving the boardroom was sober, but focused.
To 'reach depletion of' a resource or supply means to exhaust it entirely through sustained consumption or use, leaving none remaining. In academic discourse, the expression is employed to describe the total exhaustion of finite materials, funds, or capacities within a given system or study context.
Type
Transitive verb phrase
Collocations
reach depletion of reserves — used when describing the exhaustion of stored resources in logistical or environmental contexts
reach depletion of supplies — common in research methodology sections to explain experimental constraints
reach depletion of capacity — applied in systems analysis to indicate the point at which a system can absorb no further load
reach depletion of funds — appropriate in research administration and policy discourse when budgetary exhaustion is described
reach depletion of available [resource] — a flexible academic construction allowing precise specification of the depleted entity
⚠️ Watch out
Writers should ensure that 'reach depletion of' is always followed by a noun phrase specifying the depleted resource; omitting the object (e.g. writing 'the system reached depletion' without specifying what was depleted) renders the construction grammatically incomplete and semantically vague. Additionally, avoid combining this expression with progressive aspect in formal written academic prose, as constructions such as 'was reaching depletion of' can appear stylistically awkward; the simple past or present perfect is generally preferred.
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Dr Ferreira had been meticulous in her preparation. Every reagent was catalogued, every volume calculated to the nearest millilitre. Yet by the third week of fieldwork in the Atacama, her team had reached depletion of its portable electrolyte solution stockpile — a miscalculation attributed to the unexpected duration of soil sampling at altitude. She filed a formal incident report noting that the expedition had similarly reached depletion of its backup filter membranes two days prior. Both shortfalls, she concluded in her logistical review, were attributable to modelling assumptions that had underestimated daily consumption under physiological stress. The experience reshaped her provisioning protocols permanently.
The Vanishing Margin: Resource Exhaustion and the Ethics of Exploration
Throughout the history of scientific exploration, the moment at which an expedition reaches depletion of its essential provisions has served not merely as a logistical crisis, but as a revealing index of the assumptions embedded in the planning process itself. The well-documented failure of Burke and Wills in 1861, for instance, reflects a broader epistemological overconfidence — a belief that the landscape could be navigated and subdued within the timeframes imposed by European institutional expectations rather than ecological realities.
Contemporary scholarship in the environmental humanities has begun to reframe such historical episodes less as tales of individual error and more as systemic critiques of resource governance. When a research unit in an isolated field setting reaches depletion of critical consumables, the event exposes the often invisible calculus of privilege that determines who receives logistical support, how risk is distributed across expedition hierarchies, and whose knowledge of local resource availability is consulted — or ignored — during the planning phase.
This analytical lens proves particularly productive when applied to twenty-first-century scientific expeditions in contested or fragile environments, where the ethical stakes of resource consumption extend well beyond the expedition party itself and into the communities and ecologies that bear the cumulative costs of repeated human incursion.