Ai-uchi

Ai-uchi (n.) 1. The exchange of simultaneous cuts or thrusts which would deserve a score of ippon in a match or practice if independently delivered; i.e. one player strikes men while the other simultaneously strikes dō. In a match aiuchi is not counted as yūkō datotsu. 2. A case in which both strike simultaneously, i.e. men and men, but both fail to land a blow is also considered aiuchi.