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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)
  1. (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.
  2. (informal) used to tell somebody rudely to be quiet synonym shut up
    • Just belt up, will you!

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influence
verb
 
 
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