The Collaborative International Dictionary of English v.0.48:

Brandish \Bran"dish\, v. t. [imp. & p. p. Brandished; p. pr. &
   vb. n. Brandishing.] [OE. braundisen, F. brandir, fr. brand
   a sword, fr. OHG. brant brand. See Brand, n.]
   1. To move or wave, as a weapon; to raise and move in various
      directions; to shake or flourish.
      [1913 Webster]

            The quivering lance which he brandished bright.
                                                  --Drake.
      [1913 Webster]

   2. To play with; to flourish; as, to brandish syllogisms.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Brandish \Bran"dish\, n.
   A flourish, as with a weapon, whip, etc. "Brandishes of the
   fan." --Tailer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

brandish
    n 1: the act of waving [syn: flourish, brandish]
    v 1: move or swing back and forth; "She waved her gun" [syn:
         brandish, flourish, wave]
    2: exhibit aggressively; "brandish a sword"

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "brandish":
   advertise, affect, air, betoken, blazon forth, breathe,
   bring forth, bring forward, bring into view, bring out,
   bring to notice, dangle, demonstrate, develop, disclose, display,
   disport, divulge, dramatize, emblazon, embody, enact, evidence,
   evince, exhibit, expose, expose to view, express, flap, flash,
   flaunt, float, flourish, flutter, fly, give sign, give token,
   highlight, hold up, illuminate, incarnate, indicate, make clear,
   make plain, manifest, materialize, mean, parade, perform, present,
   produce, put forth, put forward, represent, reveal, roll out,
   set forth, shake, show, show forth, show off, sport, spotlight,
   swing, token, trot out, trumpet, trumpet forth, undulate, unfold,
   vaunt, wag, wave, wield, wigwag