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1.                 From English-Hindi FreeDict Dictionary ver. 1.6:
                   
   
   
                   
                     
   flatten /flˈatən/ <V>
   1. समतल~होना[करना]
         "Please flatten out the map of this area on the table."
   2. पूरी तरह हरा देना
         "He was comletely flattened by his arguments."