ticktack

tick·tack also tic-tac  (tktk)

n.

1. A steady ticking sound, as of a clock.

2. A prankster's device for tapping on a door or window from a distance.

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[Imitative.]

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ticktack [ˈtɪkˌtæk]

n

1. (Individual Sports & Recreations / Horse Racing) Brit 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

[from tick¹]

Thesaurus

Noun	1.	ticktack - system of signalling by hand signs used by bookmakers at racetracks signal, signaling, sign - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped" Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
Verb	1.	ticktack - make a sound like a clock or a timer; "the clocks were ticking"; "the grandfather clock beat midnight" ticktock, tick, beat sound, go - make a certain noise or sound; "She went `Mmmmm'"; "The gun went `bang'"