/ˈɑːstrəsaɪz/
os·tra·cize (BrE also os·tra·cise)
BrE /ˈɒstrəsaɪz/
NAmE /ˈɑːstrəsaɪz/
~ sb
(formal)
to refuse to let sb be a member of a social group; to refuse to meet or talk to sb
SYN shun
He was ostracized by his colleagues for refusing to support the strike.