Source : Webster's Revised Unabridged Dictionary (1913)

Brustle \Brus"tle\, v. i. [imp. & p. p. {Brustled}; p. pr. & vb.
   n. {Brustling}.] [OE. brustlien and brastlien, AS. brastlian,
   fr. berstan to burst, akin to G. prasseln to crackle. See
   {Burst}, v. i.]
   1. To crackle; to rustle, as a silk garment. [Obs.] --Gower.

   2. To make a show of fierceness or defiance; to bristle.
      [Obs.]

   {To brustle up}, to bristle up. [Obs.] --Otway.

Brustle \Brus"tle\, n.
   A bristle. [Obs. or Prov.] --Chaucer.