ἀποδυτέον
From LSJ
ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
English (LSJ)
A one must strip, τινά Luc.Herm.38; one must put off, χιτῶνας Porph.Abst.1.31. II (from Pass.) ἀ. ταῖς γυναιξίν they must strip off their clothes, Pl.R.457a.