Opt in
/ɒpt ɪn/B2
UpperIntermediate
1. To choose to participate in or be involved with something, especially a service or program.
- Customers need to opt in to receive the monthly newsletter.
- She decided to opt in for the premium service package.
- You must opt in if you wish to receive email notifications.
- The new policy allows employees to opt in to additional benefits.
- He opted in to the trial version of the software to test its features.
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