I.to ward off, keep off, a thing from a person, τί τινι Il.; ἀρκεῖν τὸ μὴ οὐ θανεῖν to keep off death, Soph.
2.c. dat. only, to defend, assist, succour, Hom., Soph.
II.to be strong enough, to be sufficient, to suffice, c. inf., Aesch., Soph.; c. part., ἀρκέσω θνήσκουσα my death will suffice, id=Soph.; οὐκ ἤρκουν ἰατροὶ θεραπεύοντες Thuc.
3.absol. to be enough, be strong enough, avail, hold out, Aesch., etc.:—part., ἀρκῶν, οῦσα, οῦν, sufficient, enough, Hdt., attic