butter wouldn't melt in someone's mouth
idiom
chiefly British
—used to say that a person who appears to be innocent, sincere, or kind is really not
Cite this Entry
“Butter wouldn't melt in someone's mouth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/butter%20wouldn%27t%20melt%20in%20someone%27s%20mouth. Accessed 1 Mar. 2025.
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