Source : Webster's Revised Unabridged Dictionary (1913)

Cock \Cock\ (k[o^]k), v. t. [imp. & p. p. {Cocked} (k[o^]kt); p.
   pr. & vb. n. {Cocking}.] [Cf. Gael. coc to cock.]
   1. To set erect; to turn up.

            Our Lightfoot barks, and cocks his ears. --Gay.

            Dick would cock his nose in scorn.    --Swift.

   2. To shape, as a hat, by turning up the brim.

   3. To set on one side in a pert or jaunty manner.

            They cocked their hats in each other's faces.
                                                  --Macaulay.

   4. To turn (the eye) obliquely and partially close its lid,
      as an expression of derision or insinuation.

   {Cocked hat}.
      (a) A hat with large, stiff flaps turned up to a peaked
          crown, thus making its form triangular; -- called also
          {three-cornered hat}