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

 

belt up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    belt up

    (British English)
     
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  1. 1(North American English buckle up) (informal) to fasten your seat belt (= a belt worn by a passenger in a vehicle)
  2. 2(informal) used to tell somebody rudely to be quiet synonym shut up Just belt up, will you!

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