scratch someone's back
Do someone a favor in hopes that a favor will be returned. For example, I don't mind driving this time—she's scratched my back plenty of times. It also is put as you scratch my back and I'll scratch yours, as in If you do the laundry I'll do the cooking—you scratch my back and I'll scratch yours. This idiom was first recorded in 1704.
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How to use scratch someone's back in a sentence
And yes, someone has already called Spencer a “Small Fry,” har har.Freaking Out About Age Gaps in Gay Relationships Is Homophobic|Samantha Allen|January 9, 2015|DAILY BEAST
Think back to the Bush-Kerry race of 2004, the Thrilla in Vanilla.
Back in New York, the slow pace and inward focus of her yoga practice was less fulfilling.How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze|Lizzie Crocker|January 9, 2015|DAILY BEAST
Music is a huge part of the tone of Black Dynamite overall—going back to the original 2009 movie on which the series is based.‘Black Dynamite’ Presents Police Brutality: The Musical|Stereo Williams|January 9, 2015|DAILY BEAST
The al Qaeda-linked gunmen shot back, but only managed to injure one officer before they were taken out.
I waited three months more, in great impatience, then sent him back to the same post, to see if there might be a reply.The Boarded-Up House|Augusta Huiell Seaman
Ages back—let musty geologists tell us how long ago—'twas a lake, larger than the Lake of Geneva.
The boys were tumbling about, clinging to his legs, imploring that numerous things be brought back to them.
With a suffocating gasp, she fell back into the chair on which she sat, and covered her face with her hands.The Pastor's Fire-side Vol. 3 of 4|Jane Porter
She was holding the back of her chair with one hand; her loose sleeve had slipped almost to the shoulder of her uplifted arm.