ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
ŏpertānĕus: a, um, adj. opertus,
I concealed, secret (post-Aug.): opertanea sacra, the secret rites of the Bona Dea, Plin. 10, 56, 77, § 156: di opertanei, who dwell in the bowels of the earth, Mart. Cap. 1, § 44>