選擇不加入
這一家最貼近核心畫面：本來會把你算進去，而你決定站到外面。一個是那個動作，一個是把制度設計成這樣的形容詞。
noun · B2
The act of choosing not to join a system or not to accept an agreement that you would otherwise be part of; also the special arrangement or clause that allows this.
選擇退出；不參加（的權利）
核心畫面
One way to hold this word is a line of people who were counted in before anyone asked them. Staying put takes no effort at all; leaving takes one deliberate step out of the line. An opt-out is that step, or the gap in the rope that lets you take it. Every use keeps the same two parts: something that would include you by default, and a decision to stand outside it.
可以想成一排人，而且他們是在還沒被問過之前就先被算進去的。留在隊伍裡完全不用花力氣；要離開，才得自己往外跨那一步。o…更多收起
可以想成一排人，而且他們是在還沒被問過之前就先被算進去的。留在隊伍裡完全不用花力氣；要離開，才得自己往外跨那一步。opt-out 就是那一步，或是繩子上讓你跨出去的那個缺口。它的每個用法都留著同樣的兩個部分：一個預設會把你算進去的東西，加上一個「我不要」的決定。From the word’s history
Wiktionary records the word as formed from opt plus out. The verb opt is simply to choose, and out sets the direction of the choice, so the noun names a choice that points away from the group.
Wiktionary 記載這個字由 opt 加 out 組成。動詞 opt 就是「做選擇」，out 則決定了選擇的方向。所以這個名詞講的是一個「往外」的選擇——選了它，人就站到團體外面。
Wiktionary (packet extract), entries 'opt-out' (noun and adj): 'From opt + out.' — kaikki:3f6f69a190036ae4:1002215605:4898
Two branches
脫離原本的共同體系
同樣是往外跨一步，只是跨出去的不是個人，而是一整個機構：學校、醫院、電台。它們原本被納在一個共同的安排裡，現在選擇自己來。
noun · C1
In Britain, when a state school or hospital chooses to control its own money and run itself, instead of being controlled by the local government.
（英國學校、醫院）脫離地方管理、自主