A harness, consisting of a headstall, bit, and reins, fitted about a horse's head and used to restrain or guide the animal. A curb or check: put a bridle on spending. Nautical A span of chain, wire, or rope that can be secured at both ends to an object and slung from its center point. To put a bridle on. To control or restrain with or as if with a bridle. See Synonyms at restrain. To lift the head and draw in the chin as an expression of scorn or resentment. To show anger or resentment; take offense: bridling at the criticism.