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butter wouldn't melt in sb's mouth

Definition

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 Learner's Dictionary & Thesaurus © Cambridge University Press)

“butter wouldn't melt in sb's mouth” in other dictionaries

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