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
See deceive.
Use Ar. κόλυμβος, ὁ, κολυμβίς, ἡ.
