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underthrust

American  
[uhn-der-thruhst] / ˈʌn dərˌθrʌst /

noun

Geology.

  1. a thrust fault in which the footwall moved and the hanging wall did not (overthrust ).

underthrust British  
/ ˈʌndəˌθrʌst /

noun

  1. geology 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 Compare overthrust

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of underthrust

First recorded in 1890–95; under- + thrust

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.