Definition of "Drain" :

noun: emptying something accomplished by allowing liquid to run out of it

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: make weak

"Life in the camp drained him."

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: flow off gradually

"The rain water drains into this big vat."