: a swiveling or lever device pressed by the foot to drive a machine                                      
                
                    
            
              treadled; treadling
                                     
    
            
        
    ˈtred-liŋ,
                                        ˈtre-dᵊl-iŋ 
                                
              
          
                                                      : to operate a treadle                                      
                
                    
                                
              
          
                                                      : to operate (a machine) by a treadle                                      
                
                    
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  Merriam-Webster unabridged




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