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1.                 From English-Hindi FreeDict Dictionary ver. 1.6:
                   
   
   
                   
                     
   undermine /ˌʌndəmˈaɪn/ <VT>
   1. सुरंग~खोद
         "The cliffs were undermined by the sea."
   2. दुर्बल~बना~देना
         "Repeated failures hasn't undermined his determination."