κακεργέτις
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)
ιδος, ἡ, Herm.in Phdr.p.75 A. (written κακοεργ- Porph.Antr.30, s.v.l.):— also κᾰκ-γάτις [ᾰ], Them.Or.2.33d.
German (Pape)
[Seite 1298] ιδος, ἡ, fem. zum Vorigen, Sp.