Liddell-Scott-Jones

ὀμφακίζω (omphakizō) be sour ^G:V

ὀμφακίζω-ίζω,

to be unripe, properly of grapes, [Refs]; of olives, [Refs]; of other fruits, [Refs 1st c.AD+]; of oil, [Refs 2nd c.AD+]

__2 of a vine, bear sour grapes, [LXX]
__II in middle, Σικελὸς ὀμφακίζεται the Sicilian steals sour grapes, proverbial of one who will steal anything however worthless, [Refs 5th c.BC+]

_{LSJ Scripture Refs: LXX.Isa.18.5}