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

Definition of "leave a bad taste in sb's mouth" - British English Dictionary

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leave a bad taste in sb's mouth

If an ​experienceleaves a ​badtaste in ​yourmouth, you have an ​unpleasantmemory of it: I ​think we all ​felt he'd been ​treated very ​unfairly and it ​left a ​badtaste in ​ourmouths.
(Definition of leave a bad taste in sb's mouth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)