money-back
adjective [ before noun ] uk/ˈmʌn.i.bæk/ us/ˈmʌn.i.bæk/
（不满意）可退款的
used to describe an agreement between a business and customer in which the customer's money will be returned if they are not satisfied with the product or service
a money-back deal/offer/guarantee 不满意可退款的交易／推销／担保