Green’s Dictionary of Slang

(US) lit. or fig., a blow.

1883		T.B. Reed Willoughby Captains (1887) 52: ‘It’s a jolly soak being stopped the river’.
1904		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.
1919		Van Loan ‘Chivalry in Carbon County’ in Score by Innings (2004) 328: The wryneck hit me an awful soak in the ribs.