If you do something for me, I'll do something for you.
If you could fix my laptop computer, I will fix your car. You scratch my back and I'll scratch yours.
I think we can help each other out here. I'll lend you my camera on Monday if you let me borrow your bicycle for the weekend. You scratch my back and I'll scratch yours.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.