Meaning: If you opt in, you choose to accept something, or do something, that is offered to you as an option.
- opt in When they're purchasing a product online, we give our customers the chance to subscribe to our newsletter, but we only send it to those who've opted in.
- opt in We have English classes for our workers. They don't have to attend, but if they opt in they're expected to complete the course.
Customers who want the extended warranty have to opt in, which means they get it