συγκροτεῖν

From LSJ

ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)

Source

Greek > English (Woodhouse Verbs Reversed)

(see also συγκροτέω): beat metal, weld together