do a favor

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Related to do a favor: stick with, run by, let off, in turn

do someone a favor

 and do someone a good turn
to perform a helpful service to someone. Would you please do me a favor and take this letter to the post office? My neighbor did me a good turn by lending me his car.
See also: favor

do yourself a favor

to do something that will have a good effect on you or give you an advantage Why don't you do yourself a favor and take a vacation this summer?
See also: favor