tic-tac man

noun
🔊/ˈtɪk tæk mæn/
🔊/ˈtɪk tæk mæn/
(plural tic-tac men)
(British English)
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  1. (in the past旧时) a bookmaker (= a man who takes bets) at a horse racing course, who communicated information to other bookmakers there by means of tic-tac, a special language of signals involving movements of the hands and arms