opt-out
/ˈɒptˈaʊt/noun
1- an instance of choosing not to participate in something决定不参与, 决定退出：
opt-outs from key parts of the treaty.
决定退出条约的关键部分。
1.1
- Brit. an instance of a school or hospital withdrawing from local authority control〈英〉（学校, 医院）决定自主管理（摆脱地方当局的控制）。