ἀντιτάσσειν
From LSJ
ἄμεικτον ἑαυτοῖς καταστῆσαι → refuse to admit him to their society
Greek > English (Woodhouse Verbs Reversed)
(see also: ἀντιτάσσω) engage, match, bring into conflict, match one against another, range opposite, set one against another