χείριος
From LSJ
ἔγνω δὲ φώρ τε φῶρα καὶ λύκος λύκον → the thief knows the thief and the wolf knows the wolf, and thief knows thief and wolf his fellow wolf, set a thief to catch a thief
English (LSJ)
α, ον,
A = ὑποχείριος, in the hands, under control, E.Andr.411; mostly with a Verb, χειρίαν ἀφείς τινι having left me in the power of, captive to, another, S.Aj.495; ἐλάβετε . . Ἑλένην χειρίαν; did you get her into your power? E.Cyc.177; χ. ἁλοῦσα Id.Ion1257 (troch.).
German (Pape)
[Seite 1345] = ὑποχείριος, unter Händen, in der Gewalt; χειρίαν ἀφείς τινι Soph. Ai. 490; Eur. Andr. 412; χείριον λαβεῖν τινα, Einen in seine Gewalt bekommen, Cycl. 177 Andr. 629; χει ρία ἁλοῦσα Ion 1257.