Tap2  —v. (-pp-) 1 (foll. By at, on) strike a gentle but audible blow. 2 (often foll. By against, on, etc.) Strike or cause (a thing) to strike lightly (tapped me on the shoulder). 3 (often foll. By out) make by a tap or taps (tapped out the rhythm). 4 tap-dance. —n. 1 a light blow; rap. B sound of this. 2 a tap-dancing. B metal attachment on a tap-dancer's shoe. [imitative]