Green’s Dictionary of Slang

soak n.2

[soak v.2 ]

(US) a blow.

[US]T.A. Dorgan in Zwilling TAD Lex. (1993) 73: Most of the fellows who draw the color line nowadays say that they don’t think it becomes a gentleman to swap soaks with a shine.
[US]Van Loan ‘Chivalry in Carbon County’ in Score by Innings (2004) 328: The wryneck hit me an awful soak in the ribs.