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
(1) Messer1, der, mensor; vgl. »Feldmesser«.(2) Messer2, das, culter. – kleines M., cultellus: jmdm. das M. an die Kehle setzen, alqm iugulare. – / Messer-, durch den Genet. cultri.