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Meaning of overthrust

o•ver•thrust

Pronunciation: (ō'vur-thrust"), [key]
— n. Geol.
  1. a thrust fault with a low dip and a large slip.
  2. a thrust fault in which the hanging wall was the one that moved (opposed to underthrust).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.