Do me/us a favour!

informal

Definition

something you say in answer to a stupid and impossible suggestion

"Why don't you tell the police what happened?" "Oh, do me a favour!"

(Definition of Do me/us a favour! from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Synonyms and related words:

If a problem preys on your mind, you think about it and worry about it a lot

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