ὁμόσε ἰέναι
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
Greek > English (Woodhouse)
close with, come to close quarters with, come to close quarters