To cause liquid to flow out of

• The water will soon drain away.

  Tatoeba · CK · CC BY 2.0 FR

• The school drains the pool once a month.

  Tatoeba · CK · CC BY 2.0 FR

To lose liquid

To flow gradually

To deplete of energy or resources

To convert a perennially wet place into a dry onerare

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

To filterrare

To fall off the bottom of the playfieldrare

To drinkrare

To make a shotrare

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

• That's money down the drain.

  Tatoeba · CK · CC BY 2.0 FR

• All the efforts went down the drain.

  Tatoeba · Imp · CC BY 2.0 FR

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