1. 
[syn: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setose, setaceous, spiny, thorny]
The Collaborative International Dictionary of English v.0.48:
Bristle \Bris"tle\, v. t. [imp. & p. p. Bristled; p. pr. & vb.
   n. Bristling.]
   1. To erect the bristles of; to cause to stand up, as the
      bristles of an angry hog; -- sometimes with up.
      [1913 Webster]
            Now for the bare-picked bone of majesty
            Doth dogged war bristle his angry crest. --Shak.
      [1913 Webster]
            Boy, bristle thy courage up.          --Shak.
      [1913 Webster]
   2. To fix a bristle to; as, to bristle a thread.
      [1913 Webster]
WordNet (r) 3.0 (2006):
bristled
    adj 1: having or covered with protective barbs or quills or
           spines or thorns or setae etc.; "a horse with a short
           bristly mane"; "bristly shrubs"; "burred fruits";
           "setaceous whiskers" [syn: barbed, barbellate,
           briary, briery, bristled, bristly, burred,
           burry, prickly, setose, setaceous, spiny,
           thorny]