opt in
phrasal verb
opted in; opting in; opts in
Definition of opt in
: to choose to do or be involved in something
The company offered a new health insurance plan so that more workers would opt in.
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“Opt in.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/opt%20in. Accessed 9 Aug. 2022.
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