The Collaborative International Dictionary of English v.0.48:

Cog \Cog\ (k[o^]g), v. t. [imp. & p. p. Cogged (k[o^]gd); p.
   pr. & vb. n. Cogging.] [Cf. W. coegio to make void, to
   beceive, from coeg empty, vain, foolish. Cf. Coax, v. t.]
   [1913 Webster]
   1. To seduce, or draw away, by adulation, artifice, or
      falsehood; to wheedle; to cozen; to cheat. [R.]
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            I'll . . . cog their hearts from them. --Shak.
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   2. To obtrude or thrust in, by falsehood or deception; as, to
      cog in a word; to palm off. [R.]
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            Fustian tragedies . . . have, by concerted
            applauses, been cogged upon the town for
            masterpieces.                         --J. Dennis
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            To cog a die, to load so as to direct its fall; to
            cheat in playing dice.                --Swift.
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The Collaborative International Dictionary of English v.0.48:

Cog \Cog\, n. [OE. cogge; cf. D. kog, Icel. kuggr Cf. Cock a
   boat.]
   A small fishing boat. --Ham. Nav. Encyc.
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The Collaborative International Dictionary of English v.0.48:

Cog \Cog\, v. i.
   To deceive; to cheat; to play false; to lie; to wheedle; to
   cajole.
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         For guineas in other men's breeches,
         Your gamesters will palm and will cog.   --Swift.
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The Collaborative International Dictionary of English v.0.48:

Cog \Cog\, n.
   A trick or deception; a falsehood. --Wm. Watson.
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The Collaborative International Dictionary of English v.0.48:

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.
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   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.
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   3. (Mining.) One of the rough pillars of stone or coal left
      to support the roof of a mine.
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The Collaborative International Dictionary of English v.0.48:

Cog \Cog\, v. t.
   To furnish with a cog or cogs.
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   Cogged breath sound (Auscultation), a form of interrupted
      respiration, in which the interruptions are very even,
      three or four to each inspiration. --Quain.
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WordNet (r) 3.0 (2006):

cog
    n 1: a subordinate who performs an important but routine
         function; "he was a small cog in a large machine"
    2: tooth on the rim of gear wheel [syn: cog, sprocket]
    v 1: roll steel ingots
    2: join pieces of wood with cogs