Bailly
ἐπι·νέφω, v. ἐπινεφέω.
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LSJ
bring clouds over the sky, Arist. Pr. 944b26; ἐπινέφει ὁ Ζεύς Alex. 29; ἐ. [ἄνεμος] Thphr. Vent. 61; or impers., ἐπινέφει it is cloudy, Id. CP 3.24.4. (In codd. freq. accentuated as if from ἐπινεφέω.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)