ξένῳ δὲ σιγᾶν κρεῖττον ἢ κεκραγέναι → it's better for a stranger to keep silence than to shout (Menander)
κερκάς: -άδος, ἡ· «κρὲξ τὸ ὄρνεον» Ἡσύχ.