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English definition of “belt up”

belt up

(FASTEN) UK (US buckle up) informal phrasal verb with belt     /belt/ verb
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 (FASTEN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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