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Phrase(s): You ain’t just whistlin’ Dixie.
Rur. You are right. • Tom: Sure is hot today. Bill: Yeah, you ain’t just whistlin’ Dixie. It’s a scorcher. • Charlie: That was a good movie. Jane: You ain’t just whistlin’ Dixie. It was the best I’ve ever seen.
McGrawhill's American Idioms And Phrasal Verbs