verb (used without object)
to make a choice; choose (usually followed by for ).
Verb phrases
opt out, to decide to leave or withdraw: to opt out of the urban rat race and move to the countryside.

1875–80; < French opter to choose, divide < Latin optāre to wish for, desire, pray for, choose, select

unopted, adjective

1. select, pick, elect, prefer.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opt (ɒpt)
vb (when intr, foll by for)
See also opt in See also opt out to show preference (for) or choose (to do something)
[C19: from French opter, from Latin optāre to choose]

opt out
vb (often foll by of)
1.  to choose not to be involved (in) or part (of)
2.  the act of opting out, esp of local-authority administration: opt-outs by hospitals and schools

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1877, from Fr. opter "to choose," from L. optare "choose, desire" (see option). To opt out is attested from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

opt out

Choose not to participate, as in Our school opted out of the state competition. [Slang; mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Other people should be able to opt out without penalty.
Then voluntarily opt out of using the new technology once it becomes convenient
  to use.
Authors and publishers could opt out of the program.
When things are not going well, they can opt out of their commitments to others.
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