ticktack

noun

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.

verb (used without object)

3. to make a repeated ticking or tapping sound: Sleet ticktacked against the window panes.

noun

1. British a system of sign language, mainly using the hands, by which bookmakers transmit their odds to each other at racecourses
2. US a ticking sound, as made by a clock