πολλῶν ὁ καιρὸς γίγνεται διδάσκαλος → the critical moment will turn out to be the teacher of many things
run away: Ar. and P. ἀποδιδράσκειν.
desert: Ar. and P. αὐτομολεῖν; see desert.
withdraw privily: P. ὑπεξέρχεσθαι.