tick tack

Noun

 * 1)  The sound of repeated tapping, knocking, or clicking.
 * 2)  A device used to tap on a window or door from a distance.
 * , a sign language used by bookmakers.
 * 1)  A device used to tap on a window or door from a distance.
 * , a sign language used by bookmakers.
 * , a sign language used by bookmakers.