ἀντιποιέω

1. to do in return , τι (Plato Philosophus): absolute to retaliate , (Xenophon Historicus)

2. Mid. to exert oneself about a thing, seek after, lay claim to , with genitive, (Thucydides), etc.; with infinitive, ἀντ. ἐπίστασθαί τι to lay claim to knowing, (Plato Philosophus)

3. to contend with one for a thing, ἀντ. τινὶ τῆς ἀρχῆς (Xenophon Historicus); τινι περί τινος (Xenophon Historicus) (ML)