upthrow

From Middle English upthrowen, equivalent to up- +‎ throw.

upthrow (third-person singular simple present upthrows, present participle upthrowing, simple past upthrew, past participle upthrown)

1. (archaic, poetic) To throw or cast upwards.
   • 1819, Lord Byron, Don Juan, II.29:

     For fifty tons of water were upthrown / By them per hour [...].

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.

upthrow (plural upthrows)

1. (geology) A fault in which a mass of material has been thrown up from below.

• throw up, throw-up, throwup