get-out-of-jail-free card
noun [ C ] informal uk/ˌɡet.aʊt.əvˌdʒeɪlˈfriː ˌkɑːd/ us/ˌɡet.aʊt.əvˌdʒeɪlˈfriː ˌkɑːrd/
免狱卡，免罪卡
something that allows you to avoid an unpleasant result of your actions, for example a punishment or duty
He warns Americans that their nationality is not a get-out-of-jail-free card if they break the law abroad. 他警告美国人，如果他们在国外违反法律，他们的美国国籍可不等于免罪卡。