unbridle

from WordNet (r) 3.0 (2006)
unbridle
    v 1: remove the bridle from (a horse or mule) [ant: {bridle}]
from 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]
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