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.

Synonyms

(fasten one's seat belt): buckle up

Antonyms

(antonym(s) of “shut up”): belt out