ὀμφᾰκ-ίζω · omphak-izō — LSJ
to be unripe, prop. of grapes, Gp. 5.43.3, al. ; of olives, ib. 3.13.5 ; of other fruits, Dsc. 2.159, Philum. ap. Aët. 9.33 ; of oil, Sor. 1.46, 50.
of a vine, bear sour grapes, LXX Is. 18.5.
in Med., Σικελὸς ὀμφακίζεται the Sicilian steals sour grapes, prov. of one who will steal anything however worthless, Epich. 239, cf. Aristaenet. 2.7.