Definition of tic-tac in English:

tic-tac

(also tick-tack)

noun

  • [mass noun] (in the UK) a kind of manual semaphore used by racecourse bookmakers to exchange information.

Origin

Mid 16th century (denoting a repeated ticking sound): imitative; compare with tick-tock. The current usage (originally slang) dates from the late 19th century.

Pronunciation:

tic-tac

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