Meaning of “butter wouldn't melt in sb's mouth” in the English Dictionary

English

"butter wouldn't melt in sb's mouth" in English

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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.

(Definition of “butter wouldn't melt in sb's mouth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)