( BrE ) ( US cash-back ) / ˈkæʃbæk; NAmE / noun
1.
[ U ] if you ask for cashback when you are paying for goods in a shop / store with a debit card (= a plastic card that takes money directly from your bank account) , you get a sum of money in cash, that is added to your bill
2.
[ U , C ] a sum of money that is offered to people who buy particular products or services :
There's £200 cashback on this computer if you buy before January 31.