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English definition of “belt up”

belt up

UK
verb uk phrasal verb with belt   /belt/ us  

(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.Interrupting and preventing from speaking

(FASTEN)

(US buckle up) informal 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.Driving and operating road vehicles
(Definition of belt up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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