The Collaborative International Dictionary of English v.0.48:

Trap \Trap\, v. t. [imp. & p. p. Trapped; p. pr. & vb. n.
   Trapping.] [Akin to OE. trappe trappings, and perhaps from
   an Old French word of the same origin as E. drab a kind of
   cloth.]
   To dress with ornaments; to adorn; -- said especially of
   horses.
   [1913 Webster]

         Steeds . . . that trapped were in steel all glittering.
                                                  --Chaucer.
   [1913 Webster]

         To deck his hearse, and trap his tomb-black steed.
                                                  --Spenser.
   [1913 Webster]

         There she found her palfrey trapped
         In purple blazoned with armorial gold.   --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

trapped
    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]