- 1. butter wouldn't melt in someone's mouth (idiomatic) The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, he or she really is untrustworthy, disagreeable, or mean-spirited). (idiomatic) The identified person is prim and proper, standoffish, cool, or dispassionate. Source: ecdict
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butter wouldn't melt in someone's mouth
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identifiedidiomaticpersonbutterappearsbenigncalmcontrarycooldisagreeabledispassionateintegralmean-spiritedmeltmild-manneredmouthprimproperreallyshestandoffishsuggestionuntrustworthy
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