DRAINS

A conduit allowing liquid to flow out of an otherwise contained volume; a plughole (UK)

"The drain in the kitchen sink is clogged."

An access point or conduit for rainwater that drains directly downstream in a (drainage) basin without going through sewers or water treatment in order to prevent or belay floods.

Something consuming resources and providing nothing in return.

"That rental property is a drain on our finances."

To lose liquid.

"The clogged sink drained slowly."

To flow gradually.

"The water of low ground drains off."

To cause liquid to flow out of.

"Please drain the sink. It's full of dirty water."