- a repetitive sound, as of ticking, tapping, knocking, or clicking: the ticktack of high heels in the corridor.
- a device for making a tapping sound, as against a window or door in playing a practical joke.
verb (used without object)
- to make a repeated ticking or tapping sound: Sleet ticktacked against the window panes.
- British a system of sign language, mainly using the hands, by which bookmakers transmit their odds to each other at racecourses
- US a ticking sound, as made by a clock