ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
P. and V. αἰωρεῖσθαι.
shake: P. and V. σείεσθαι.
toss up and down: P. and V. σαλεύειν, P. ἀποσαλεύειν.
Met., hesitate, waver: P. and V. ὀκνεῖν, κατοκνεῖν, P. ἀποκνεῖν.