opt out
Opt out (verb) means to choose not to take part in something you would otherwise be included in automatically. Example: “You are enrolled in the pension by default, but you can opt out at any time.”
How to use opt out
Learner’s notesIn plain EnglishTo say no to something you were signed up for automatically.
Neutral; common in legal, policy and consumer contexts.
The preposition is always 'of': you opt out of something, never opt out from it.
Trace the full origin ↓Fill the gap
Can you complete this real example?
You are enrolled in the pension by default, but you can _____ at any time.
Etymology
From opt, via French opter from Latin optare 'to choose', plus the particle out.