A touch or hit in response to an opponent's touch, particularly in fencing where both fencers score points in a rapid exchange.
From counter- + touch. Touch developed from Old French touchier. In fencing, a touch means hitting the opponent with the blade—countertouch describes a reciprocal hit.
Modern fencing rules had to account for countertouch—when two fencers hit each other simultaneously, determining who touched first required watching slow-motion replays long before sports invented instant replay.
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