The headword is aorist active of katapalai/w, third person singular. Entry follows a scholion on Aristophanes, Acharnians 710, where the headword occurs (web address 1). The subject of the verb there is Pericles' opponent, the by-now elderly Thucydides Melesiou (OCD(4) s.v. Thucydides(1)), probably the grandfather of the historian theta 414; he appears in other wrestling metaphors elsewhere, e.g. Plutarch, Pericles 8.
cf. generally kappa 689, kappa 690.