opt out

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).

ビジネス英語
to choose not to be part of an activity, arrangement, etc.:
New employees are automatically enrolled in the union, unless they opt out.
(Cambridge ビジネス英語辞典 からの opt out の定義 © Cambridge University Press)

opt outの例
Allowing richer individuals to opt-out of contributions to public insurance is likely to decrease the progressivity of a given financing system.
Cambridge English Corpus から

Sometimes, it is important to recognize that the flexibility of opt-out provisions is limited by what is technologically feasible.
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In some countries, however, employees are given the option to opt-out to another pension benefit provider at the time engagement.
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One alternative is automatic enrollment in personal accounts with a voluntary opt-out provision.
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Currently, many opt-out procedures administered by web sites and others are hopeless and cumbersome, making it nearly impossible for citizens to exert real control.
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Persons who do not want samples of their tissue to be used for research will have to notify the opt-out register.
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Allowing richer individuals to 'opt-out' of contributions to public insurance is likely to decrease the progressivity of a given financing system.
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Other countries continue this pattern of differences between opt-out and opt-in systems.
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Farmers with small enterprises opt-out due to reasons associated with the factors organic regulations and management.
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Despite many industry-wide agreements providing opt-out clauses and growing pressure from employers for greater enterprise-based pay determination, the bargaining system is delivering pay and price stability.
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Family members can refuse to join; however, once a majority of the potential kin group has agreed, individual families find it hard to opt-out or not participate.
Cambridge English Corpus から

Instead, it is a potential opt-out from stage 3, the single currency.
Hansard archive から(ハンサード公文書からの例)

First, if the opt-out was exercised, our country would certainly stand to lose inward investment.
Hansard archive から(ハンサード公文書からの例)

If not, what on earth is the opt-out for?
Hansard archive から(ハンサード公文書からの例)

There is not unity on the opt-out from the social charter or on the social charter.
Hansard archive から(ハンサード公文書からの例)

- Cambridge Dictionary