Source : Webster's Revised Unabridged Dictionary (1913)

Cog \Cog\, n. [OE. cogge; cf. D. kog, Icel. kuggr Cf. {Cock} a
   boat.]
   A small fishing boat. --Ham. Nav. Encyc.

Cog \Cog\, v. i.
   To deceive; to cheat; to play false; to lie; to wheedle; to
   cajole.

         For guineas in other men's breeches, Your gamesters
         will palm and will cog.                  --Swift.

Cog \Cog\, n.
   A trick or deception; a falsehood. --Wm. Watson.

Cog \Cog\, n. [Cf. Sw. kugge a cog, or W. cocos the cogs of a
   wheel.]
   1. (Mech.) A tooth, cam, or catch for imparting or receiving
      motion, as on a gear wheel, or a lifter or wiper on a
      shaft; originally, a separate piece of wood set in a
      mortise in the face of a wheel.

   2. (Carp.)
      (a) A kind of tenon on the end of a joist, received into a
          notch in a bearing timber, and resting flush with its
          upper surface.
      (b) A tenon in a scarf joint; a coak. --Knight.

   3. (Mining.) One of the rough pillars of stone or coal left
      to support the roof of a mine.

Cog \Cog\, v. t.
   To furnish with a cog or cogs.

   {Cogged breath sound} (Auscultation), a form of interrupted
      respiration, in which the interruptions are very even,
      three or four to each inspiration. --Quain.

Cog \Cog\, v. t. [imp. & p. p. {Cogged}; p. pr. & vb. n.
   {Cogging}.] [Cf. W. coegio to make void, to beceive, from
   coeg empty, vain, foolish. Cf. {Coax}, v. t.]
   1. To seduce, or draw away, by adulation, artifice, or
      falsehood; to wheedle; to cozen; to cheat. [R.]

            I'll . . . cog their hearts from them. --Shak.

   2. To obtrude or thrust in, by falsehood or deception; as, to
      cog in a word; to palm off. [R.]

            Fustian tragedies . . . have, by concerted
            applauses, been cogged upon the town for
            masterpieces.                         --J. Dennis

            To cog a die, to load so as to direct its fall; to
            cheat in playing dice.                --Swift.

Source : WordNet®

cog
     n : tooth on the rim of gear wheel [syn: {sprocket}]
     [also: {cogging}, {cogged}]

cog
     v 1: roll steel ingots
     2: join pieces of wood with cogs
     [also: {cogging}, {cogged}]