Μαραθωνομάχης
From LSJ
ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην, πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → hard it is to learn the mind of any mortal or the heart, 'till he be tried in chief authority | it is impossible to know fully any man's character, will, or judgment, until he has been proved by the test of rule and law-giving
English (LSJ)
[μᾰχ], ου, ὁ,
A one who fought at Marathon: prov. of a veteran, Ar.Ach.181, Nu.986:—also Μᾰρᾰθωνο-μάχος, ὁ, APl.4.233.8 (Theaet.), D.L.1.56, and v.l. Ar.Nu.l.c.
Greek (Liddell-Scott)
Μᾰρᾰθωνομάχης: [ᾰ], -ου, ὁ, ὁ πολεμήσας ἐν τῇ ἐν Μαραθῶνι μάχῃ, παροιμία ἐπὶ γενναίου ἀρχαίου στρατιώτου, Ἀριστοφ. Ἀχ. 181, Νεφ. 986, Ἀνθ. Πλαν. 233· - Μαραθωνομάχος, ὁ, Διογ. Λ. 1. 56.