Cashback is money returned to you after a purchase. Get cashback, a cashback offer, cashback at the till.
In a shop it also means taking cash out while paying by card, which is a quite different thing. Cashback on a card is really a discount paid later and often forgotten.
1nouncashbackMoney returned to you after a purchase.
“The card gave one per cent cashback on everything.”
cashback is money.