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Definition of belt up phrasal verb from the Oxford Advanced Learner's Dictionary

belt up

phrasal verb

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belt up (British English)

(North American English buckle up)
(informal) to fasten your seat belt (= a belt worn by a passenger in a vehicle)
- Get in the car and belt up.
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(informal) used to tell somebody rudely to be quiet synonym shut up
- Just belt up, will you!

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belt up

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noun

From the Word list

B2

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