arbitrate
From LSJ
ἢ δεῖ σιωπᾶν ἢ λέγειν τὰ καίρια → you should either keep silence or make timely remarks (Menander)
English > Greek (Woodhouse)
verb intransitive
arbitrate between: P. διαιτᾶν (dat.).
arbitrate on: P. and V. βραβεύειν (acc.), P. διαιτᾶν (acc.).