ALL meanings of underthrust
un·der·thrust
U u - noun underthrust a thrust fault in which the footwall moved and the hanging wall did not (opposed to overthrust). 1
- noun underthrust a reverse fault in which the rocks on the lower surface of a fault plane have moved under the relatively static rocks on the upper surface 0
- verb underthrust (geology, of a tectonic plate) To thrust under another. 0