Green’s Dictionary of Slang

sock n.1

1. credit; esp. as on sock, on credit.

[UK]B.E. Dict. Canting Crew.
[UK]Sl. Dict.

2. a farthing.

[UK]T. Shadwell Squire of Alsatia I i: I went up to the Gaming Ordinary and lost all my Ready; they left me not a rag or sock.

3. a pocket.

[UK]B.E. Dict. Canting Crew n.p.: Sock c. a Pocket [...] Not a Rag in my Sock, c. I han’t a Farthing in my Pocket.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
[UK]B.M. Carew Life and Adventures.

4. the store of money itself, as hidden away in a bag, safe etc; a sum of money.

[Aus]Sydney Sportsman (Surry Hills, NSW) 5 Oct. 1/2: The article referred to simply dealt with the possible amount of real and personal estate that would be left by Adams, and surely there is no great harm in discussing the size of any person's sock’.
[US]Irwin Amer. Tramp and Und. Sl. 176: Sock.–The pocket or bank-roll.
[US]D. Lamson We Who Are About to Die 193: They got about nine grand in the sock up in their walk-up.
[US]W.R. Burnett Asphalt Jungle in Four Novels (1984) 137: Quigley lost a big sock horse-gambling.
[Aus]Cusack & James Come in Spinner (1960) 61: That’s what marriage without a sock in the bank would mean.
[Aus]D. Cusack Caddie 263: I had a tidy little sock in the bank.

5. anything used a receptacle for money, e.g. a wallet, a purse.

[Aus]E. Dyson ‘On a Bender’ in Benno and Some of the Push 79: The lady ’elp asked [...] if the legal infant ’ad the price iv the drinks he’d ordered in his sock.
[US]G. Henderson Keys to Crookdom 414: Pocketbook. Purse, poke, leather, sock.
[US]Ersine Und. and Prison Sl. 69: sock, n. Any place where one keeps money.
[US] ‘“Ace” and its Progeny’ in AS XVIII:1 Feb. 71/2: ace-in-the-sock. An emergency or reserve fund or supply of money.

6. a filthy, messy room, i.e. as used by a student, young man etc. [coined by UK novelist Martin Amis (b.1949) and enjoyed brief popularity].

[UK]Observer Rev. 24 June 3: You’ve got to have somewhere you can go and hide, your own ’sock’ as Martin Amis said.

7. (N.Z. prison) constr. with the, a weapon created by tying something heavy, e.g. a pool ball, into a sock [? underpinned by sock n.2 (1)].

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 172/2: sock, the n. a weapon made from a pool ball in a sock.

SE in slang uses

In phrases

— one’s socks off (v.) (also — the socks off)

used as an intensifier, e.g. blow the socks off v.; knock the socks off under knock v.; lick the socks off under lick v.1 ; rot someone’s socks off under rot v.; see also synons. at fuck v., pop v.1 (1), screw v.

Afro-American (Baltimore, MD) 1 Oct. 10/8: A crowd [...] which gathered recognised Bill [Robinson] and offered to ‘whip the boy’s socks off’.
[US]E. Condon We Called It Music 98: The consensus was that, ‘Joe Oliver beat the socks off Keppard’.
[UK]A. Bleasdale Who’s Been Sleeping in my Bed 22: All the drunks laughin’ their socks off, shoutin’ pissed-up things like, ‘Watch out, there’s danger about’.
[UK]A. Sillitoe Birthday 90: He nearly had me sobbing my socks off again about the bad old days.
[US]J. Stahl ‘Pure’ in Love Without 158: ‘Said he was a “dok-tor”,’ the pastor giggled. This tickled the socks off him.
[UK]BBC World Service Sports Hour 13 Feb. [radio] He’s working his socks off there.
put a sock in it (v.) (also put a bag in it, shove a sock in it, stick..., stuff...) [it gags the mouth]

to stop talking, to be quiet; esp. as imper. put a sock in it!

[UK]N&Q 12 Ser. IX 347: Sock In It (Put a). Form of request to make less noise.
[UK]‘J.H. Ross’ Mint (1955) 46: Seaton, with puckered painful forehead, begged him to put a sock in it.
[UK](con. WW1) P. MacDonald Patrol 165: ‘Put a bag in it. Make more row’n a Band of Hope outin’’.
[UK]M. Marshall Tramp-Royal on the Toby 148: He tells us tall yarns [...] till we have to request him to put a sock in it.
[Scot]Eve. Teleg. (Angus, Scot.) 3 Oct. 1/2: When ordered to stand to attention [...] Winter said:— ‘I will do that when I consider it necessary, Put a sock in it’.
[UK](con. 1912) B. Marshall George Brown’s Schooldays 87: Oh, shove a sock in it, please do.
[Aus]D. Niland Shiralee 131: Macauley told him tersely to put a sock in it.
[Aus]J. Hibberd Dimboola (2000) 94: Put a sock in it, ferret-face!
[Aus]D. Maitland Breaking Out 293: You can stick a bloody sock in it and sit down too!
[UK]J. Sullivan ‘Christmas Crackers’ Only Fools and Horses [TV script] Now put a sock in it for ’arf hour or so will you?
[UK]S. Armitage ‘D-notice’ in Dead Sea Poems 30: Clamp the jaw, put / a sock and not a foot in it.
[US]R. Campbell Wizard of La-La Land (1999) 234: Oh, stuff a sock in it, will you?
[US]J. Lethem Fortress of Solitude 430: ‘Stand out for search,’ said Carroll. ‘What up, man?’ ‘Put a sock in it and stand out.’.
[UK]S. Kelman Pigeon English 220: Put a sock in it, Connor.
put one’s socks on (v.)

Aus. to bet heavily (on).

[Aus]Sport (Adelaide) 1 Feb. 12/2: They Say [...] T.T. is going to ride Rope Hair Jane in the Grand National. ‘Put your socks on ’im, boys’.
something in socks (n.)

a bachelor, a single man, supposedly what ‘every woman wants’.

[UK]Partridge DSUE (1984) 1113/2: [...] since ca. 1910.

In exclamations

socks on!

(N.Z. prison) excl. that calls on an inmate to put on their anonymizing balaclava prior to making an assault.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 172/2: socks on! int. used by a criminal putting on a balaclava or a stocking in order to do a hit.