Longman Dictionary of Contemporary English homepage

opt-out

 noun
     
opt-out [countable] British English
1 when a person or group chooses not to join a system or accept an agreement:
an opt-out clause
opt-out on/from
the government's opt-out on the euro
2 when a school or hospital in Britain chooses to control its own money, instead of being controlled by local government:
an opt-out school
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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