Real Dictionary

bridle
countable noun: A bridle is a set of straps that is put around a horse's head and mouth so that the person riding or driving the horse can control it.
verb: If you bridle, you show that you are angry or offended by moving your head and body upwards in a proud way.

bridle in American English
a head harness for guiding a horse: it consists of headstall, bit, and reins
to pull one's head back quickly with the chin drawn in as an expression of anger, scorn, pride, etc.
intransitive verb: to draw up the head and draw in the chin, as in disdain or resentment
noun: part of the tack or harness of a horse, consisting usually of a headstall, bit, and reins
transitive verb: to put a bridle on

bridle in British English
noun: a headgear for a horse, etc, consisting of a series of buckled straps and a metal mouthpiece (bit) by which the animal is controlled through the reins
verb: to put a bridle on (a horse, mule, etc)