1. (noun) drain, drainage
emptying something accomplished by allowing liquid to run out of it
2. (noun) drain
tube inserted into a body cavity (as during surgery) to remove unwanted material
3. (noun) drain, drainpipe, waste pipe
a pipe through which liquid is carried away
4. (verb) drain
a gradual depletion of energy or resources
"a drain on resources"; "a drain of young talent by emigration"
5. (verb) drain, run out
flow off gradually
"The rain water drains into this big vat"
6. (verb) drain
deplete of resources
"The exercise class drains me of energy"
7. (verb) drain
empty of liquid; drain the liquid from
"We drained the oil tank"
8. (verb) enfeeble, debilitate, drain
make weak
"Life in the camp drained him"
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Definition of 'drain' 
