Definition of "upthrow" [up•throw]

• A throwing upward. (noun)
• Geology An upward displacement of rock on one side of a fault. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This is termed the upthrow of the fault, as at B; and the downthrow, as at A."
• "The words came in hoarse, croaked, suppressed accents, with a separation of the hands, and an upthrow of the head and projecting cars which had such a comical look of being crushed beneath the weight of the battened-down cap."
• "For instance, de Beaumont suggested that the Pyrenees had been uplifted in a single sudden upthrow (en un seul jet) and that this elevation had occurred at the same time as that of the Alps. Von Buch and de Beaumont suggested that in the geological past there had occurred events on such an enormous scale as to be catastrophic in nature and without counterpart in the modern expe - rience of man."