do (one) a kindness
To do a favor or something nice for one. Hey, do me a kindness and take these bags into the kitchen while I get the others from the car. A: "Correct me if I'm wrong, but that sounds like an intern's job." B: "Just do me a kindness and clean up the files, will ya?" A: "Hey, can you do me a kindness?" B: "Sure, what's up?" A: "Can you hold the door open for me?"
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