Quick definitions from WordNet (drain)

▸ noun:  emptying accomplished by draining
▸ noun:  a gradual depletion of energy or resources ("A drain on resources")
▸ noun:  a pipe through which liquid is carried away
▸ noun:  tube inserted into a body cavity (as during surgery) to remove unwanted material
▸ verb:  flow off gradually ("The rain water drains into this big vat")
▸ verb:  empty of liquid; drain the liquid from ("We drained the oil tank")
▸ verb:  deplete of resources ("The exercise class drains me of energy")
▸ verb:  make weak ("Life in the camp drained him")
▸ name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5166)

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▸ Also see drain