English edit

Etymology edit

down- +‎ fault

Noun edit

downfault (plural downfaults)

  1. (geology) A graben (area sunken relative to surrounding land).

Verb edit

downfault (third-person singular simple present downfaults, present participle downfaulting, simple past and past participle downfaulted)

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