Pronunciation: (drān),[key] —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. Surg.a 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. a. an artificial watercourse, as a ditch or trench.
b. a natural watercourse modified to increase its flow of water.
7. go down the drain, a. to become worthless or profitless.
b. to go out of existence; disappear.