tick-tack

n [U] (Brit) system of signalling by moving the hands, used by bookmakers on racecourses （赛马场上以接受赛马赌注为业者使用的）手势信号.

thunderer, thundering, thunderous, thunderously, thunderstorm, thunderstruck, thundery, Thur (also Thurs), Thursday, thus, thwart, thy, thyme, thyroid, ti, tiara, tibia, tic, tick, tick off, tick-tack-toe, tick-tock, ticker, ticker-tape, ticket, ticket office, ticket-office, ticking, ticking-off, tickle, tickler, ticklish, ticklishness, ticky-tacky, tidal, tidal wave, tidbit, tiddler, tiddly, tiddly-winks,