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

buckle up

phrasal verb

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buckle up (North American English)

(British English belt up)

(informal) to fasten your seat belt (= a belt worn by a passenger in a vehicle)
- Get in the car and buckle up.
Oxford Collocations Dictionary
Buckle up is used with these nouns as the object:
strap
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See buckle up in the Oxford Advanced American Dictionary

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buckle up

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noun

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B2

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