English edit

Etymology edit

up- +‎ fault

Noun edit

upfault (plural upfaults)

  1. (geology) A horst (area raised relative to surrounding land).

Verb edit

upfault (third-person singular simple present upfaults, present participle upfaulting, simple past and past participle upfaulted)

  1. (geology) To form a fault that is raised relative to the surrounding land.