butter wouldn't melt in one's mouth
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Be overly coy or demure; be insincere. For example, She looked quite innocent, as though butter wouldn't melt in her mouth, but we knew better. Already a proverb in John Heywood's collection of 1546, this metaphoric expression alleges that one is literally so cool that butter inside the mouth would not melt.
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Words nearby butter wouldn't melt in one's mouth
butter tree, butter up, butterweed, butterwort, Butterworth, butter wouldn't melt in one's mouth, buttery, buttfuck, butt-fucker, butthead, butt hinge
The American Heritage® Idioms Dictionary
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