- an upheaval, as of the earth’s surface.
- Geology. an upward displacement of rock on one side of a fault.
verb (used with object), up·threw, up·thrown, up·throw·ing.
- to throw or cast up or upward.
- geology the upward movement of rocks on one side of a fault plane relative to rocks on the other side
- rare an upward thrust or throw; upheaval