ταχυτής
τὸν αὐτὸν ἔρανον ἀποδοῦναι → pay him back in his own coin, repay him in his own coin, pay someone back in their own coin, pay back in someone's own coin, give tit for tat, pay back in kind
English (LSJ)
ῆτος, Dor. τᾰχυ-τάς, ᾶτος, ἡ (on the accent v. Hdn.Gr.1.83),
A quickness, swiftness, of dogs, Od.17.315; ταχυτῆτος ἄεθλα, of the race, Il.23.740; τ. ποδῶν Xenoph.2.1, 17, Pi.O.1.95; ἥσσων ἐς ταχυτῆτα Hdt.3.102, cf. Anaxag.9, Archyt.1, Pl.La.192a, Arist. Mete.342a5; of persons, hastiness, Id.EN1150b27.
German (Pape)
[Seite 1077] ῆτος, ἡ (Accent nach Arcad. p. 28, 9), wie τάχος, Schnelligkeit, bes. Schnellfüßigkeit; ταχυτῆτος ἄεθλα, vom Wettlaufe, Il. 23, 740; von Hunden, Od. 18, 315; ταχυτὰς ποδῶν, Pind. Ol. 1, 95 I. 4, 10; u. in Prosa, Plat. Charm. 159 d Lach. 192 b, wie Sp.