underthrust

verb
un·der·thrust | \ ˌən-dər-ˈthrəst \
underthrust; underthrusting

Definition of underthrust 

transitive verb

: to insert (a faulted rock mass) into position under a passive rock mass

First Known Use of underthrust

1893, in the meaning defined above

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The first known use of underthrust was in 1893

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