/tik"tak'/ , 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.
3. to make a repeated ticking or tapping sound: Sleet ticktacked against the window panes.
Also, tictac .
[ 1540-50; imit. See TICK 1 ]