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

american-english dictionary

"turn over a new leaf" in British English

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turn over a new leaf

C2 to start behaving 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 change your behavior 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)