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English definition of “opt in”

opt in

phrasal verb with opt     /ɒpt/ US  /ɑːpt/ verb [I]
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.Taking and choosing
(Definition of opt in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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