Definition of "upthrow"

upthrow

verb
third-person singular simple present upthrows, present participle upthrowing, simple past upthrew, past participle upthrown
1. (archaic, poetic) To throw or cast upwards.
  Quotations
  For fifty tons of water were upthrown / By them per hour [...].
  1819, Lord Byron, Don Juan, II.29
2. (geology, transitive) To throw up (a mass of material) from below, causing a fault.
3. (geology, intransitive, of a mass of material) To be thrown up from below, causing a fault.
noun
plural upthrows
1. (geology) A fault in which a mass of material has been thrown up from below.