- upthrust⇄noun 1. an upward push.
2. (Geology.) an upward movement of part of the earth's crust. - upthrust⇄upthrust, noun, verb.
- upthrust⇄v.t. to push up, as in an upthrust.
Ex. The region as a whole consists of a geological anticline, ... upthrust by an outer ripple of those same Miocene foldings that formed the Alps and the Himalayas (New Scientist).