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English definition of “opt out”

opt out

phrasal verb with opt     /ɒpt/ US  /ɑːpt/ verb [I]
to choose not to be part of an activity or to stop being involved in it: Within any society, there will usually be people who decide to opt out (= choose not to live the way most people do). Employees can choose to opt out of the pension plan.Refusing and rejecting
(Definition of opt out from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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