money-back guarantee

noun
🔊/ˌmʌni bæk ˌɡærənˈtiː/
🔊/ˌmʌni bæk ˌɡærənˈtiː/
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  1. 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。