verb [ vn ] co-opt sb (onto / into sth)
1.
to make sb a member of a group, committee, etc. by the agreement of all the other members :
She was co-opted onto the board.
2.
to include sb in sth, often when they do not want to be part of it
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WORD ORIGIN
mid 17th cent.: from Latin cooptare , from co- together + optare choose.