(obsolete) Talkative; eager to speak. / With the mouth open. / Gaping in surprise, wonder or astonishment.

(intransitive, slang) To complain or otherwise express oneself in a loud, immoderate manner. / (transitive, intransitive, slang) To talk impudently, especially to one's superior.

Third-person singular simple present indicative form of mouth off

simple past tense and past participle of mouth off

present participle of mouth off

(informal) Regularly using vulgar language, especially strong profanities.

(idiomatic, euphemistic) The characteristic of regularly using vulgar language, especially strong profanities. / (idiomatic) A person having this characteristic.

plural of motor mouth

foot-and-mouth disease

Alternative spelling of mouth breather