opt in (to something)

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opt in (to something)

To choose to participate or be involved in something. I don't usually opt in to guided tours, but I'd heard good things about this one. Any student who wishes to opt in needs to have their permission slips handed in by the end of the week.
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

opt in(to something)

to choose to join in. She opted into our plans. She opted in almost immediately.
See also: opt
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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