cold-cocking

Verb

cold-cock (third-person singular simple present cold-cocks, present participle cold-cocking, simple past and past participle cold-cocked)

1. (slang, transitive) To hit someone with a cold cock.
2. (slang, transitive) To hit someone with a club, bottle, or any object that gives additional force to the blow.
3. (slang, transitive) To knock someone unconscious.
   • "I can't believe it. You cold-cocked the big stud." "He blindsided and cold-cocked him," Greer said proudly.1992, Ken Kesey, Sailor Song, page 153