Slang To knock (another) unconscious.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "coldcock" in a sentence
"Self-styled tough-guy supporters were always urging Obama to coldcock someone."
"The YouTubed Stahl seems to have mellowed a bit, pensive and steely-eyed instead of steely-eyed and ready to coldcock a nun."
"Kennedy's "hypothetical," which got so much attention from the slow Justice Mr. Souter, is such a perfect example of muddled disputation by the Court because of its preposterous self-contradictions that I am surprised Justice Scalia didn't get up and just coldcock the turkey right there on the spot."