Pronunciation: (tik'tak"),[key] —n. 1. a repetitive sound, as of ticking, tapping, knocking, or clicking: the ticktack of high heels in the corridor. 2. a device for making a tapping sound, as against a window or door in playing a practical joke.
—v.i. to make a repeated ticking or tapping sound: Sleet ticktacked against the window panes.Also,tictac.