ἀντιποιεῖσθαι
From LSJ
Greek > English (Woodhouse Verbs Reversed)
(see also ἀντιποιέω): claim, arrogate to oneself, assert a claim to, claim as one's own, claim for oneself, pretend to
Lexicon Thucydideum
vindicare sibi, to claim for oneself, 1.28.2, 4.122.4.