WordReference Random House Learner's Dictionary of American English © 2019
drain /dreɪn/USA pronunciation   v. 
  1. to empty by drawing off liquid: [+ object]to drain a swamp.[+ object (+ of + object)]Drain the wound (of blood) before you apply the bandage.[no object]The crankcase has to drain before you put on the new filter.
  2. to empty by drinking:[+ object]He drained his glass in one huge swallow.
  3. to use up the resources of:[+ object (+ of + object ) ]He drained his parents of every cent they had.

n. [countable]
  1. a pipe or other device that allows a liquid to drain:The drains are probably clogged.
  2. something that causes a large outflow or depletion:These constant doctor bills are a drain on our finances.
Idioms
  1. Idiomsgo down the drain, to become without profit;
    be wasted:All my work went down the drain because I didn't have time to finish.

drain•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2019
drain  (drān),USA pronunciation v.t. 
  1. to withdraw or draw off (a liquid) gradually;
    remove slowly or by degrees, as by filtration:to drain oil from a crankcase.
  2. to withdraw liquid gradually from;
    make empty or dry by drawing off liquid:to drain a crankcase.
  3. to exhaust the resources of:to drain the treasury.
  4. to deprive of strength;
    tire.

v.i. 
  1. to flow off gradually.
  2. to become empty or dry by the gradual flowing off of liquid or moisture:This land drains into the Mississippi.

n. 
  1. something, as a pipe or conduit, by which a liquid drains.
  2. Surgerya material or appliance for maintaining the opening of a wound to permit free exit of fluids.
  3. gradual or continuous outflow, withdrawal, or expenditure.
  4. something that causes a large or continuous outflow, expenditure, or depletion:Medical expenses were a major drain on his bank account.
  5. an act of draining.
  6. [Physical Geog.]
    • Geographyan artificial watercourse, as a ditch or trench.
    • Geographya natural watercourse modified to increase its flow of water.
  7. Idiomsgo down the drain: 
    • to become worthless or profitless.
    • to go out of existence;
      disappear.
draina•ble, adj. 
drainer, n. 
  • bef. 1000; Middle English dreynen, Old English drēhnian, drēahnian to strain, filter; akin to dry


Collins Concise English Dictionary © HarperCollins Publishers::

drain /dreɪn/ n
  1. a pipe or channel that carries off water, sewage, etc
  2. an instance or cause of continuous diminution in resources or energy; depletion
  3. a device, such as a tube, for insertion into a wound, incision, or bodily cavity to drain off pus, etc
  4. down the drainwasted
vb
  1. (transitive) often followed by off: to draw off or remove (liquid) from: to drain water from vegetables, to drain vegetables
  2. (intransitive) often followed by away: to flow (away) or filter (off)
  3. (intransitive) to dry or be emptied as a result of liquid running off or flowing away: leave the dishes to drain
  4. (transitive) to drink the entire contents of (a glass, cup, etc)
  5. (transitive) to consume or make constant demands on (resources, energy, etc); exhaust; sap
  6. (intransitive) to disappear or leave, esp gradually: the colour drained from his face
  7. (transitive) (of a river, etc) to carry off the surface water from (an area)
  8. (intransitive) (of an area) to discharge its surface water into rivers, streams, etc
Etymology: Old English drēahnian; related to Old Norse drangr dry wood; see dry



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