to shake or quake: to move with a violent, shuddering motion, the way the ground heaves in an earthquake
At its heart this word pictures the ground itself lurching and heaving in an earthquake. It is the most physical, most violent kind of shaking, and from that center it reaches out to anything that can tremble that hard: mountains, the sky, city walls, coastlands, whole nations.
Its favorite setting is the moment God draws near or acts. Again and again the earth quakes at his coming, and the land and the distant shores shake at the thunder of a great power's fall. So the word carries dread and awe, not a casual jolt. The prophets reach for it to paint the Day of the LORD, when heaven and earth alike are made to reel.
The same trembling motion also appears dialed down, at the edges of the word's range: the restless, springing quiver of a war-horse eager for battle, and grain rippling in the wind like a whole forest swaying. And often God is the one who does the shaking on purpose, setting the heavens, the earth, and the nations trembling by his own hand.