Definition of “by/in leaps and bounds” - English Dictionary

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“by/in leaps and bounds” in British English

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by/in leaps and bounds

C2 If someone or something gets better by/in leaps and bounds, he, she, or it improves very quickly:

Her Spanish has come on (= improved) in leaps and bounds this year.

(Definition of “by/in leaps and bounds” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)