Definition of “belt up” - English Dictionary

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“belt up” in British English

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belt up

UK
phrasal verb with belt uk /belt/ us /belt/ verb

(BE QUIET)

very informal used to tell someone to stop talking or making a noise:

Just belt up, will you! I'm trying to concentrate.

(FASTEN)

informal US buckle up to fasten the belt that keeps you in your seat in a car or a plane:

Don't forget, belt up before you drive off.

(Definition of “belt up” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)