Strong’s Greek
G4656 — skotoo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σκοτόω
skotoo — pronounced skot-o'-o
from 4655; to obscure or blind (literally or figuratively):--be full of darkness. see GREEK for 4655
1 occurrence in the KJV.
Revelation 16:10
And the fifth angel poured out his vial upon the seat of the beast; and his kingdom was full of darkness; and they gnawed their tongues for pain,