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English definition of “butter wouldn't melt in sb's mouth”

butter wouldn't melt in sb's mouth

used when someone looks as if they would never do anything wrong, although you feel they might: Tommy looked as if butter wouldn't melt in his mouth.Naive and trustingInexperienced (of people)
(Definition of butter wouldn't melt in sb's mouth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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