My understanding of knockdown in simple terms is no body protection, bare knuckle, only protection is mouth guard and groin guard. The match is won when one opponent knocks the other to the mat or by KO. Im guessing its more of a US term?? I didnt really come accross it until joining here we always just know it as full contact, and wearing shin pads and mitts we term as novice full contact, anyone feel free to correct me if im wrong here
Osu!