Nouns

(n)drain, drainageemptying something accomplished by allowing liquid to run out of it
(n)draintube inserted into a body cavity (as during surgery) to remove unwanted material
(n)drain, drainpipe, waste pipea pipe through which liquid is carried away
(n)draina gradual depletion of energy or resources“a drain on resources”, “a drain of young talent by emigration”

Verbs

(v)drain, run outflow off gradually“The rain water drains into this big vat”
(v)draindeplete of resources“The exercise class drains me of energy”
(v)drainempty of liquid; drain the liquid from“We drained the oil tank”
(v)enfeeble, debilitate, drainmake weak“Life in the camp drained him”