Source: Drive (2011), an American crime thriller film. Ryan agreed to help the husband of a woman he likes to rob a pawnshop so the husband can repay mobsters. A friend of Ryan's: A lot of guys mess around with married women, but you're the only one I know who robs a joint just to pay back the husband. I wonder if to pay back here is used in the sense "to give someone the same amount of money that you borrowed from them". Ryan didn't owe the husband anything, he just wanted to help. Perhaps it's a mistake? "Redeem", is the word that should be there, no?