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opt

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opt/ˈɑːpt/verb
optsoptedopting
opt
/ˈɑːpt/
verb
optsoptedopting
Learner's definition of OPT  
[no object]
: to choose one thing instead of another — often + for — often followed by to + verb

opt in

[phrasal verb]
: to choose to do or be involved in something

opt out

[phrasal verb]
: to choose not to do or be involved in something — often + of
— see also opt-out
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