ἢ δεῖ σιωπᾶν ἢ λέγειν τὰ καίρια → you should either keep silence or make timely remarks (Menander)
Ar. ὠστίζεσθαι (dat.), P. and V. ὠθεῖν, ἐλαύνειν, V. βίᾳ ὠθεῖν, πρὸς βίαν ἐλαύνειν, P. περιωθεῖν.