צָלַל‎ (tsâlal|tsaw-lal'|verb|be dark)
[Heb] צָלַל‎ ETCBC: צלל‎ (verb|grow dark) OSHL: r.cc.aa TWOT: 1921 GK: H7511
Derivation: a primitive root (identical with through the idea of hovering over (compare צֶלֶם‎));
Strong's: to shade, as twilight or an opaque object
KJV: begin to be dark, shadowing.