πρέπει
From LSJ
εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses
Greek Monolingual
ΝΜΑ
(γ' εν. πρόσ.) βλ. πρέπω.
English (Woodhouse)
(see also: πρέπω) it behoves, it is fit, it is incumbent on, it is meet, it is proper