Liddell-Scott-Jones

περκάζω (perkazō) to grow dark ^G:V

περκάζω-άζω,

(πέρκος ={περκάζωνός}) become dark, turn dark, of grapes beginning to ripen, ὀπώρα ἄκραισι περκάζωάζουσα οἰνάνθαις [LXX+4th c.BC+]; of olives, [Refs]; of flowers, [Refs 3rd c.AD+]

__2 metaphorically, of young men, whose beard begins to darken their faces, [Refs 3rd c.BC+]
__II active, make dark-coloured, [Refs 1st c.AD+]

_{LSJ Scripture Refs: LXX.Amos.9.13}