The Collaborative International Dictionary of English v.0.48:
coldcock \coldcock\ v. t. to to knock to the ground with force. Syn: deck, dump, knock down, floor. [WordNet 1.5]WordNet (r) 3.0 (2006):
coldcock v 1: knock down with force; "He decked his opponent" [syn: deck, coldcock, dump, knock down, floor]