That drains.

(uncountable) The practice of exploring drains, tunnels, or sewers. / (countable) The process by which something is drained or emptied.

present participle of drain

Material that has been separated by draining / plural of draining

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

(intransitive) To lose liquid. / (intransitive) To flow gradually. / (transitive, ergative) To cause liquid to flow out of. / (transitive, ergative) To convert a perennially wet place into a dry one.

simple past tense and past participle of drain

Lacking motivation and energy; very tired; knackered. / Of a battery, empty of charge; discharged.

plural of drain

Third-person singular simple present indicative form of drain