ναυμαχητέον
From LSJ
μηδὲν κοτυλίζειν, ἀλλὰ καταπάττειν χύδην → not to sell by the cupful, but to dole out indiscriminately | not to sell by retail but wholesale
English (LSJ)
A one must fight by sea, Arist.Rh.1376a2.
Greek (Liddell-Scott)
ναυμαχητέον: ῥηματ. ἐπίθετ. τοῦ ναυμαχέω, δεῖ ναυμαχεῖν, Ἀριστ. Ρητ. 1. 15. 14.