תהילים צט:א פירוש: רש״י

nations will quake [This] deals with the war of Gog and Magog. Then the nations will quake, as the matter that is said (Zech. 14:12): “And this shall be the plague, etc.”

will falter Heb. תנוט, an expression of (73:2): “my feet faltered (נטוי).”