The headword, a form of xeiro/w, literally means 'was made inferior', but is almost always applied to military or agonistic contexts where "defeated" or "captured" is the connotation.
This third person singular, aorist passive, must be quoted from somewhere; perhaps Herodotus 5.2.5 (web address 1) or Cassius Dio (e.g. 56.12.1), both of whom use forms of this verb frequently.