turn over a new leaf Meaning in the Cambridge English Dictionary
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Meaning of “turn over a new leaf” in the English Dictionary

"turn over a new leaf" in British English

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turn over a new leaf

C2 to ​startbehaving in a ​better way: Apparently he's ​turned over a new ​leaf and he's not ​smoking any more.
(Definition of turn over a new leaf from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"turn over a new leaf" in American English

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turn over a new leaf

to ​changeyourbehavior in a ​positive way: She ​turned over a new ​leaf and ​began getting to ​work on ​time.
(Definition of turn over a new leaf from the Cambridge Academic Content Dictionary © Cambridge University Press)