Search Result for "unbridle": 
Wordnet 3.0

VERB (1)

1. remove the bridle from (a horse or mule); 



The Collaborative International Dictionary of English v.0.48:

Unbridle \Un*bri"dle\, v. t. [1st pref. un- + bridle.]
   To free from the bridle; to set loose.
   [1913 Webster]


WordNet (r) 3.0 (2006):

unbridle
    v 1: remove the bridle from (a horse or mule) [ant: bridle]