belt up

== English == === Verb === belt up (third-person singular simple present belts up, present participle belting up, simple past and past participle belted up) (British, intransitive) To fasten one's seat belt. (British, intransitive, colloquial, derogatory, usually in imperative) To stop talking or chattering; to shut up. (slang, transitive) To beat up (someone). ==== Synonyms ==== (fasten one's seat belt): buckle up ==== Antonyms ==== (antonym(s) of “shut up”): belt out