do someone a favour
idiomPart offavour
do someone a favour — idiom
1. used informally as a short exclamation to express disbelief, annoyance, or the f
1.idiom
Definition
used informally as a short exclamation to express disbelief, annoyance, or the feeling that something is unlikely or ridiculous
Example
Oliver said he would run a marathon in under two hours. Do me a favour — he cannot even jog to the end of the street!
The manager promised everyone a bonus this year. Oh, do me a favour — they never keep their promises.