Definitions for opt out
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Princeton's WordNet
opt out, cop out(verb)
choose not to do something, as out of fear of failing
"She copped out when she was supposed to get into the hang glider"
Wiktionary
opt out(Verb)
To choose not to participate in something
Origin: From opt + out.
Citation
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"opt out." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/opt out>.

