co-opt UK /ˈkəʊˌɒpt/US /ˈkoʊˌɑpt/ verb3 •To commandeer, appropriate or take over. •To absorb or assimilate into an established group, movement, category, etc. •To elect as a fellow member of a group, such as a committee. formsco-opted · coopted · co-opting · coopting · co-opts · coopts