A.behave or speak like a barbarian, Hdt.2.57, Philostr. VA1.21, Arr.An.7.6.5; speak broken Greek, speak gibberish, Pl. Tht.175d codd. (sed leg. βατταρίζων)“; βαρβαριζόντων ἑτεροφώνων” Phld.Po.994.6; violate the laws of speech, commit barbarisms, “τῇ λέξει β.” Arist.SE165b21, cf. Plb.39.1.7, Str.14.2.28, Luc.Rh.Pr.17, 23, etc.; distd. from σολοικίζω, Phld.Rh.1.154 S.
2. trans., 'murder', mangle, “τὴν Ῥωμαίων φωνήν” Luc.Merc.Cond.24.
II. side with the barbarians, i.e. the Persians, X.HG5.2.35, Max.Tyr.4.2.