ἀλκαθεῖν
From LSJ
μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
English (LSJ)
poet. aor. (accented as pres. by Gramm., Phot. p. 76R., AB 383), assist, A. Fr. 411, S. Fr. 996.
Greek (Liddell-Scott)
ἀλκᾰθεῖν: ποιητ. ἀόρ. ἄνευ ἐνεστ. εὐχρήστου (ἴδε ἐν λ. ἀλέξω), ὑποστηρίζω, ἀναφερόμενον ἐν Α. Β. 383 ἐκ τοῦ Αἰσχύλ. (Ἀποσπ. 425) καὶ Σοφ. (Ἀποσπ. 827)· πρβλ. ἀμυναθεῖν.
Russian (Dvoretsky)
ἀλκαθεῖν: [inf. aor. 2] оказать помощь, помочь Aesch., Arph.