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Longman Dictionary of Contemporary English
opt-out
noun
EXAMPLES FROM CORPUS
▪ Delegates voted to oppose the mass opt-out plans and scrap controversial tests for seven and eleven-year-olds.
▪ He will be aware that all five candidates in that by-election were opposed to the Foresterhill opt-out.
▪ It would imply that Labour was ill-advised in ever tabling the amendment, and in believing it to undermine the opt-out.
▪ Mr Major bragged about his opt-out from the social chapter, saying that it would attract foreign investment from Britain's neighbours.
▪ Opponents to the opt-out now have a chance to lodge objections to the Education Secretary.
▪ Our country's interests can not be served by isolation or opt-out.
▪ That is what the uncertainty created by the Prime Minister's opt-out will cost us.
▪ Therefore, to excise it would not imply any reversal of Britain's opt-out.
Wiktionary
opt-out

a. Of a selection, the property of having to choose explicitly to avoid or forbid something; a decision having the default option being inclusion or permission; used particularly with regard to mailing lists and advertisement. n. 1 the act of opting out of something 2 (context British English) a school or hospital that has withdrawn from local control

Wikipedia
Opt-out

The term opt-out refers to several methods by which individuals can avoid receiving unsolicited product or service information. This ability is usually associated with direct marketing campaigns such as, e-mail ma rketing, or direct mail. A list of those who have opted out is called a Robinson list.

In the UK, the Mailing Preference Service composes the Robinson list.

Opt-out (politics)

In politics, an opt-out is when one level of government can decline or refuse to be part of a program designed by another level of government.

Usage examples of "opt-out".

Arizona's first Libertarian governor, Durwood Thornley, is proposing to extend the school voucher system to a whole variety of taxpayer opt-outs, and his critics are not very happy about it.