to have a colts tooth

from The Collaborative International Dictionary of English v.0.48
Colt \Colt\ (k[=o]lt; 110), n. [OE. colt a young horse, ass, or
   camel, AS. colt; cf. dial. Sw. kullt a boy, lad.]
   1. The young of the equine genus or horse kind of animals; --
      sometimes distinctively applied to the male, {filly} being
      the female. Cf. {Foal}.
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   Note: In sporting circles it is usual to reckon the age of
         colts from some arbitrary date, as from January 1, or
         May 1, next preceding the birth of the animal.
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   2. A young, foolish fellow. --Shak.
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   3. A short knotted rope formerly used as an instrument of
      punishment in the navy. --Ham. Nav. Encyc.
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   {Colt's tooth}, an imperfect or superfluous tooth in young
      horses.

   {To cast one's colt's tooth}, to cease from youthful
      wantonness. "Your colt's tooth is not cast yet." --Shak.

   {To have a colt's tooth}, to be wanton. --Chaucer.
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