资料来源 : Webster's Revised Unabridged Dictionary (1913)

Eyetooth \Eye"tooth\ ([imac]"t[=oo]th`), n.; pl. {Eyeteeth}
   ([imac]"t[=e]th`) (Anat.)
   A canine tooth of the upper jaw. See {Teeth}.

   {To cut one's eyeteeth}, to become acute or knowing.
      [Colloq.]