Green’s Dictionary of Slang

sock n.1

1. [late 17C; mid–late 19C] credit; esp. as on sock, on credit.

2. [late 17C] a farthing.

3. [late 17C–18C] a pocket.

4. [1920s–50s] anything used a receptacle for money, e.g. a wallet, a purse.

5. [1930s–50s] the store of money itself, as hidden away in a bag, safe etc; a sum of money.

6. [1970s] 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].

SE in slang uses

In phrases

put a sock in it (v.) (also put a bag in it, shove a sock in it, stick..., stuff...) [it gags the mouth]

[1910s+] to stop talking, to be quiet; esp. as imper. put a sock in it!

something in socks (n.)

[1910s+] a bachelor, a single man, supposedly what ‘every woman wants’.