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Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Flaches /flˈaxəs/ <neut, n, sg>
    [min.] downgrade engine road <n>, jinny road <n>, inclined drift <n>
      Synonyms: abwärts getriebene/einfallende Förderstrecke, Einfallende