The Collaborative International Dictionary of English v.0.48:

Tick \Tick\, n.
   1. A quick, audible beat, as of a clock.
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   2. Any small mark intended to direct attention to something,
      or to serve as a check. --Dickens.
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   3. (Zool.) The whinchat; -- so called from its note. [Prov.
      Eng.]
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   Death tick. (Zool.) See Deathwatch.
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