(colloquial) Not open about one's sexual orientation, romantic orientation, or gender identity. / (colloquial, by extension) Not open about some feature of one's life; often construed with about.

(intransitive, idiomatic) To tell others about one's homosexuality, bisexuality, transness, or any minority or disapproved-of belief, preference, etc., where previously this had been kept secret.

One used to store food or other household supplies: a cupboard. / (obsolete) Any private space, (particularly) bowers in the open air.

(obsolete) private / closeted, secret (especially with reference to gay people who are in the closet)

(transitive) To shut away for private discussion. / (transitive) To put into a private place for a secret interview or interrogation.

comparative form of close: more close

Someone or something that closes. / Someone or something that concludes. / (sales) Synonym of close (“the point at the end of a sales pitch when the consumer is asked to buy”)

(chiefly Britain) A room containing a flush toilet. / (UK) A flush toilet itself. / Used other than figuratively or idiomatically: see water, closet.

superlative form of close: most close.

(archaic) second-person singular simple present form of close