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1. A throwing upward.
2. Geology An upward displacement of rock on one side of a fault.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Geological Science) geology the upward movement of rocks on one side of a fault plane relative to rocks on the other side
2. rare an upward thrust or throw; upheaval
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||upthrow - (geology) a rise of land to a higher elevation (as in the process of mountain building)|
geology - a science that deals with the history of the earth as recorded in rocks
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