ἀντιστρατηγέω

A. act against as general or (generally) make war against, τινί D.H. 11.37; τοῖς ἐπιχειρήμασί τινων J. Vit. 55, cf. Max. Tyr.41.3.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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