ἐρῶν

From LSJ

κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person

Source

French (Bailly abrégé)

part. fut. de εἴρω;
part. prés. de ἐράω.