butter wouldn't melt (in somebody's mouth)
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melt — [melt] v ▬▬▬▬▬▬▬ 1¦(become liquid)¦ 2¦(disappear)¦ 3¦(become less angry)¦ 4 melt in your mouth 5 melt into somebody s arms/embrace Phrasal verbs melt away melt something<=>down melt into something ▬▬▬▬▬▬▬ [: Old English; Origin … Dictionary of contemporary English