slang. [Of obscure origin: the senses have prob. no connection with each other.]
† 1. ? A small coin. (Cf. RAG sb.1 2 c.) Obs.1
1688. Shadwell, Sqr. Alsatia, I. i. 56. I went up to the Gaming Ordinary, and lost all my Ready; they left me not a Rag or Sock.
† 2. A pocket. Obs.
a. 1700. in B. E., Dict. Cant. Crew.
3. Credit, tick.
1874. Slang Dict., 301. He gets goods on sock, while I pay ready.