Meaning of “wash your mouth out (with soap/soapy water)” in the English Dictionary

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"wash your mouth out (with soap/soapy water)" in British English

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wash your mouth out (with soap/soapy water)

humorous an expression used humorously when someone has used a rude or offensive word

(Definition of “wash your mouth out (with soap/soapy water)” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)