Definition of “leave a bad taste in sb's mouth” - English Dictionary

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“leave a bad taste in sb's mouth” in British English

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leave a bad taste in sb's mouth

If an experience leaves a bad taste in your mouth, you have an unpleasant memory of it:

I think we all felt he'd been treated very unfairly and it left a bad taste in our mouths.

(Definition of “leave a bad taste in sb's mouth” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)