ἐκμαστεύω
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 track out, ὡς κύων νεβρὸν πρὸς αἷμα ἐ. A.Eu.247, Ph. Bybl. ap. Eus.PE1.9.