What is the meaning of Drain?

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

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.

A natural or artificial watercourse which drains a tract of land.

Something consuming resources and providing nothing in return.

An act of urination.

One terminal of a field effect transistor (FET).

An outhole.

A drink.

To lose liquid.

To flow gradually.

To cause liquid to flow out of.

To convert a perennially wet place into a dry one.

To deplete of energy or resources.

To draw off by degrees; to cause to flow gradually out or off; hence, to exhaust.

To filter.

To fall off the bottom of the playfield.

To drink.

To make a shot.

dative of drai

drain

thorns

Source: wiktionary.org