buckle up Meaning in the Cambridge English Dictionary
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Meaning of “buckle up” in the English Dictionary

"buckle up" in British English

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buckle up

phrasal verb with buckle uk   us   /ˈbʌk.l̩/ verb
US informal (UK belt up) to ​fasten the ​belt that ​keeps you in ​yourseat in a ​car or a ​plane: Don't ​forget, ​buckle up before you ​startdriving.
(Definition of buckle up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"buckle up" in American English

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buckle up

phrasal verb with buckle  us   /ˈbʌk·əl/ verb [I/T]
to ​fastenyour seat belt (= ​beltattached to a ​seat): We ​believe in ​safedriving, buckling up, and ​observing the ​speedlimit.
(Definition of buckle up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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