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Phrase(s): Thanks, but no thanks.
Inf. Thank you, but I am not interested. (A way of turning down something that is not very desirable.) • Alice: How would you like to buy my old car? Jane: Thanks, but no thanks. • John: What do you think about a trip over to see the Wilsons? Sally: Thanks, but no thanks. We don’t get along.
McGrawhill's American Idioms And Phrasal Verbs