πυρέσσειν

From LSJ

ξένῳ δὲ σιγᾶν κρεῖττον ἢ κεκραγέναι → it's better for a stranger to keep silence than to shout (Menander)

Source

Greek > English (Woodhouse Verbs Reversed)

(see also πυρέσσω): be in a fever