περκάζω
From LSJ
ξένῳ δὲ σιγᾶν κρεῖττον ἢ κεκραγέναι → it's better for a stranger to keep silence than to shout (Menander)
English (LSJ)
(πέρκος
A = περκνός) become dark, turn dark, of grapes beginning to ripen, ὀπώρα ἄκραισι περκάζουσα οἰνάνθαις Chaerem. 12.2 ; ὅταν ἄρτι π. σταφυλή Thphr.HP9.11.7, cf. Hymn.Is.168, LXX Am.9.13 ; ὅταν ἄρχωνται π. οἱ βότρυες Thphr.CP3.16.3, etc. ; of olives, Gp.9.19.2 ; of flowers, Porph.VP44. 2 metaph., of young men, whose beard begins to darken their faces, Call.Lav.Pall. 76. II Act., make dark-coloured, Dsc.5.2.
