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English definition of “opt out”

opt out

verb [I] uk phrasal verb with opt   /ɒpt/ us    /ɑːpt/
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.
(Definition of opt out phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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