When you quake, you tremble and shiver. A scary sound in a dark basement might make you quake.
To quake is to move rapidly back and forth, so quickly that the movement is almost a vibration. If you've ever felt the floor quake during an actual earthquake, you know the fluttery, shaking kind of movement. A person can quake with fear, and a building can quake during a wind storm. You can also use the word quake as a noun, to describe the feeling itself. The Old English root is cwacian, or "tremble or clatter of teeth."