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Phrase(s): melt in one’s mouth
1. to taste very good. (Also can be literal.) • This cake is so good it’ll melt in your mouth. • John said that the food didn’t exactly melt in his mouth. 2. [of meat] to be very, very tender. • My steak is so tender it could melt in my mouth. • This filet will melt in your mouth!
McGrawhill's American Idioms And Phrasal Verbs