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3. look as if butter wouldn't melt in mouth

look as if butter wouldn't melt in mouth

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look as if butter wouldn't melt in one's mouth

Fig. to appear to be cold and unfeeling (despite any information to the contrary). Sally looks as if butter wouldn't melt in her mouth. She can be so cruel. What a sour face. He looks as if butter wouldn't melt in his mouth.

See also: butter, if, look, melt, mouth