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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Downthrow  \Down"throw`\,  n.  (Geol.) 
  The  sudden  drop  or  depression  of  the  strata  of  rocks  on  one 
  side  of  a  fault.  See  {Throw},  n.