money-back guarantee
noun/ˌmʌni bæk ˌɡærənˈtiː/
/ˌmʌni bæk ˌɡærənˈtiː/
- an official promise by a shop, etc. to return the money you have paid for something if it is not of an acceptable standard
（商店对不合格商品的）退款保证 - The contractors offer a full money-back guarantee on all their work.
承包商对所有工程提供全额退款保证。
- The contractors offer a full money-back guarantee on all their work.