ἀκροθινιάζεσθαι
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 Verbs Reversed)
(see also: ἀκροθινιάζομαι) choose the best, pick out the best, skim the cream of, take one's pick of