ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
ŏmissĭo: ōnis, f. omitto,I an omitting, omission (post-class.): laudis, Symm. Ep. 3, 48; 10, 62.