do (someone) a favor

idiom
variants: or do a favor for (someone)

Definition of do (someone) a favor

: to do a kind and helpful act for (someone) You can do your uncle a favor by giving him a ride. Do me a favor, please, and help me move this. the phrase Do me a favor is sometimes used in an ironic way when a person wants someone to do something that he or she should do anyway Do me a favor and get home on time for once.

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