Meaning : Flow off gradually.
The rain water drains into this big vat.
Synonyms : run out
Meaning : Deplete of resources.
The exercise class drains me of energy.
Meaning : Empty of liquid. Drain the liquid from.
We drained the oil tank.
Meaning : Emptying something accomplished by allowing liquid to run out of it.
Synonyms : drainage
Meaning : Tube inserted into a body cavity (as during surgery) to remove unwanted material.
Meaning : A gradual depletion of energy or resources.
A drain on resources.
A drain of young talent by emigration.