The Collaborative International Dictionary of English v.0.48:

Corner \Cor"ner\, v. t. [imp. & p. p. Cornered (-n?rd); p. pr.
   & vb. n. Cornering.]
   1. To drive into a corner.
      [1913 Webster]

   2. To drive into a position of great difficulty or hopeless
      embarrassment; as, to corner a person in argument.
      [1913 Webster]

   3. To get command of (a stock, commodity, etc.), so as to be
      able to put one's own price on it; as, to corner the
      shares of a railroad stock; to corner petroleum.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cornered \Cor"nered\ (-n?rd), p. a.
   1 Having corners or angles.
   [1913 Webster]

   2. In a possition of great difficulty; brought to bay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cornered
    adj 1: forced to turn and face attackers; "a stag at bay"; "she
           had me cornered between the porch and her car"; "like a
           trapped animal" [syn: at bay(p), cornered, trapped,
           treed]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "cornered":
   V-shaped, Y-shaped, akimbo, angular, at bay, aux abois, bent,
   between two fires, crooked, crotched, endangered, forked, furcal,
   furcate, geniculate, geniculated, hooked, imperiled, in a corner,
   in a predicament, in danger, in desperate case, in extremis,
   in jeopardy, jagged, jeopardized, knee-shaped, on the spot,
   pointed, saw-toothed, sawtooth, serrate, sharp, sharp-cornered,
   threatened, treed, up a stump, up a tree, zigzag