Source : Webster's Revised Unabridged Dictionary (1913)

Ticktack \Tick"tack`\, n. [See {Tick} to beat, to pat, and (for
   sense 2) cf. {Tricktrack}.]
   1. A noise like that made by a clock or a watch.

   2. A kind of backgammon played both with men and pegs;
      tricktrack.

            A game at ticktack with words.        --Milton.

Ticktack \Tick"tack`\, adv.
   With a ticking noise, like that of a watch.

Source : WordNet®

ticktack
     n : system of signalling by hand signs used by bookmakers at
         racetracks

ticktack
     v : make a sound like a clock or a timer; "the clocks were
         ticking"; "the grandfather clock beat midnight" [syn: {tick},
          {ticktock}, {beat}]