look as if butter wouldn't melt in mouth
look as if butter wouldn't melt in (one's) mouth
To appear innocent or reserved in certain company, when in fact one may have the opposite demeanor. Sure, he looks as if butter wouldn't melt in his mouth when he's around people he doesn't know, but stay a while and you'll see what he's really like.
See also: butter, if, look, melt, mouth
Farlex Dictionary of Idioms.
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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
- look as if butter wouldn't melt in (one's) mouth
- look as if butter wouldn't melt in your mouth
- butter wouldn't melt
- butter wouldn't melt (in one's mouth)
- butter wouldn't melt in one's mouth
- butter wouldn't melt in someone's mouth
- butter won't melt (in one's mouth)
- devil is not so black as he is painted
- more to the point
- eye (someone) up