drain

flow off gradually

“The rain water drains into this big vat”

a pipe through which liquid is carried away

make weak

“Life in the camp drained him”

emptying something accomplished by allowing liquid to run out of it

a gradual depletion of energy or resources

“a drain on resources”

deplete of resources

“The exercise class drains me of energy”

empty of liquid; drain the liquid from

“We drained the oil tank”

tube inserted into a body cavity (as during surgery) to remove unwanted material