This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of opt.

"The night Mrs. Clinton won the Pennsylvania primary, several months after Mrs. Clinton joined other Democrats in opting out of a debate that Fox News was to sponsor, her campaign chairman Terry McAuliffe declared live on Fox, “Fair and Balanced Fox!”"

opted    opting    opts   

optional    option   

cop out    opt out   

opt in    co-opt    opt out   

adopt    chopped    co-opt    copped    cropped