belt up

verb — 3 senses

belt up

verb
1

UK To fasten one's seat belt.

2

UK, Colloquial, Derogatory, Imperative, Regional To stop talking or chattering; to shut up.

3

Slang To beat up (someone).

Synonyms
buckle up
Antonyms
belt out

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.