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English definition of “opt in”

opt in

verb [I] uk phrasal verb with opt   /ɒpt/ us    /ɑːpt/
to choose to be part of an activity, arrangement, etc.: Company policy is to leave new workers out of the pension scheme, unless they choose to opt in.
(Definition of opt in phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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