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From LSJ

νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)

Source

Greek (Liddell-Scott)

ἀλληλομάχοι: α, οἱ μαχόμενοι πρὸς ἀλλήλους· διωρθώθη κατ’ εἰκασ. ἐν Ἀριστ. Ἱ. Ζ. 9. 1, 26, ἀντὶ ἀλληλοφάγοι.