Focus on the pronunciation of cashback
English definition of “cashback”
cashback (also cash-back)
/ˈkæʃbæk/ noun [U] UK
› MARKETING, COMMERCE an amount of money someone receives when they buy something, offered by the company selling the product as a way of persuading people to buy it: The mortgage deal includes £250 cashback.
› BANKING, COMMERCE a way of getting cash from a supermarket instead of going to a bank. You pay for the cash and your goods using a debit card (= a bank card where the money is taken from your account immediately): I'd like £50 cashback please.