Butter wouldn't melt in their mouth meaning

What does the saying 'Butter wouldn't melt in their mouth' mean?

Idiom: Butter wouldn't melt in their mouth

Meaning:

If someone looks as if butter wouldn't melt in their mouth, they look very innocent.
Country: International English | Subject Area: Food and Eating | Usage Type: Both or All Words Used
All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.
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