Definition of bridles:
(n) :
(equestrianism) The headgear with which a horse is directed and which carries a bit and reins.
(n) :
(figurative) A restraint; a curb; a check.
(v) :
(transitive) To put a bridle on.
(v) :
(transitive) To check, restrain, or control with, or as if with, a bridle; as in bridle your tongue.
(v) :
(intransitive) To show hostility or resentment.
(v) :
(intransitive) To hold up one's head proudly or affectedly.