Green’s Dictionary of Slang

closet n.

[euph.]

1. the vagina, the imagery being of a ‘hiding-place’.

[UK]T. Nabbes Covent Garden I vi: ierk.: I will tast the sweet-meats in your Ladies Closet. susan: I understand you not. ieffr.: He means you should lie under him.
[UK]Whores Rhetorick 114: It is supposed, a Lady of good practice may have each day many Clients knocking at the Closet door: by which means the Stairs will be wet and the Passage slippery, by the frequency of those that come with Fee in hand, to discharge themselves.

2. (orig. gay) a metaphorical ‘cupboard’ in which a homosexual who is unwilling to reveal his or her sexuality is seen to live; usu. in phrs. below.

implied in closet adj. (1)
[US]Alt. Eng. Dict. 🌐 closet (noun, mass) Hiding ones gayness. Term originated as ‘in the closet’, then ‘out of the closet’ to refer to acknowledging ones gayness.
[US]L. Pettiway Workin’ It 128: Everyone knows I’m gay. I ain’t in a closet.
[US]I. Fitzgerald Dirtbag, Massachusetts 194: [He] had spent his entire college career in the closet.

In derivatives

closeted (adj.)

of one who has yet to admit their homosexuality.

[US]D. Winslow ‘The San Diego Zoo’ in Broken 123: He’s a closteed gay guy.

In phrases

come out of the closet (v.)

1. (orig. US) to reveal one’s gay sexuality in public; thus out of the closet, having acknowledged one’s homosexuality.

[US]B. Rodgers Queens’ Vernacular.
[US]J. Wambaugh Choirboys (1976) 273: Alexander Blaney came out of the closet at that time.
[US]L. Kramer Faggots 36: Everyone’s out of the closet.
[UK]T. McClenaghan Submariners I i: I’ve come out of the closet.
[US]R. Campbell Alice in La-La Land (1999) 53: The urge to come out of the closet and go fagging only comes on him every so often.
[UK]Guardian G2 4 Aug. 17: The TV comedienne came out of the closet.
[UK]Guardian G2 29 Mar. 11: I want to give Jerry a slap and tell him to stop ironing his jeans or come out of the closet.

2. in non-homosexual use, to reveal a hidden aspect of oneself or one’s life.

[US]J. Lardner Crusader 169: There were six [undercover anti-corruption] police officers in all: David, Serpico, Delise, and three (a captain, a lieutenant, and a detective) who have yet to come out of the closet.
in the closet (orig. US)

1. used of a gay man/woman who has yet to reveal their sexuality in public.

[US]B. Rodgers Queens’ Vernacular.
[US]E. Torres Q&A 111: So he’s in the closet.
[US]H. Max Gay (S)language.
[UK]D. Jarman letter Smiling in Slow Motion (2000) 28: The Labour MPs should be outed first [...] I’d turn the key on the Tories and leave them in the closet.
[US](con. 1930s-40s) Kennedy & Davies Boots of Leather (2014) 37: It [sic] was plenty of gay people at that time, but [...] they kept it in the closet.
[UK]Indep. on Sun. Real Life 23 Jan. 4: It is easy to see how an in-the-closet gay viewer might look at Queer As Folk.
[UK]Guardian 30 Dec. 🌐 There is no longer any intellectual argument to justify staying in the closet on principle.
[WI]Jamaica Observer 9 Apr. 1: Jamaica is no safer, holier, or healthier than it was decades ago when these groups (homosexuals) were further back in the closet.

2. in secrecy, hidden away.

[US]G. Liddy Will 182: I told Dean I wasn’t sure that it’d be wise for me to ‘go into a closet,’ [...] If I disappeared all of a sudden, people would ask questions.
[UK]Partridge DSUE (8th edn) 228/1: since later 1970s.
D. Bank q. in Firestone Swing, Swing, Swing (1993) 329: ‘The band had a number of youngsters [...] who carried Charlie Parker records with them on the road and practiced playing bebop together in the closet very secretly.
open the closet (v.)

to reveal someone to be a homosexual, usu. against their will.

[US]B. Rodgers Queens’ Vernacular 160: to expose a fellow homosexual to his straight friends [...] open the closet.

SE in slang uses

In compounds

In phrases

closet of ease (n.) [euph.]

a lavatory or water closet.

[UK]B. Gerbier Principles of Magnificent Building 27: A Closet of ease [OED].