n. & v.
n. 1 a children's game in which one chases the rest, and anyone who is caught then becomes the pursuer. 2 Baseball the act of tagging a runner.
v.tr. (tagged, tagging) 1 touch in a game of tag. 2 (often foll. by out) put (a runner) out by touching with the ball or with the hand holding the ball.
[ 18th c.: orig. unkn. ]