opt in

phrasal verb·1 sense·particle in

Meanings

1

Choose to take part in something

Why “in”? You step inside the circle. To be in is to belong or take part.

You can opt in to the newsletter.
You can choose to receive the newsletter.
Users can opt in to text alerts.
Users can choose to receive text alerts.

Don't confuse with

opt inopt out

Opt in means choose to take part in something. Opt out means choose not to take part in something.

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