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.]
      [1913 Webster]

            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.]
      [1913 Webster]

            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.
      [1913 Webster]

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.
   [1913 Webster]

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.
   [1913 Webster]

         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.
      [1913 Webster]

   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.
          [1913 Webster]

   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.
   [1913 Webster]

   Cogged breath sound (Auscultation), a form of interrupted
      respiration, in which the interruptions are very even,
      three or four to each inspiration. --Quain.
      [1913 Webster]

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

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "cog":
   comb, commonality, commonalty, crag, creature, fang, flunky,
   follower, harrow, hoi polloi, inferior, jag, junior, lightweight,
   lower class, lower orders, masses, pawn, peak, pecten, projection,
   rake, ratchet, sawtooth, second fiddle, secondary, snag, snaggle,
   spire, sprocket, spur, steeple, subaltern, subordinate,
   third stringer, tooth, underling, understrapper, yes-man