Source : WordNet®

co-opt
     v 1: choose or elect as a fellow member or colleague; "The church
          members co-opted individuals from similar backgrounds to
          replenish the congregation"
     2: neutralize or win over through assimilation into an
        established group; "We co-opted the independent minority
        tribes by pulling them into the Northern Alliance"
     3: appoint summarily or commandeer; "The army tried to co-opt
        peasants into civil defence groups"
     4: take or assume for one's own use; "He co-opted the criticism
        and embraced it"