Pronunciation: (tik'tak"), [key]
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.
to make a repeated ticking or tapping sound: Sleet ticktacked against the window panes. Also,tictac.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.