1
                    
        a
    
          
                                          
              
          
                                                      : to step or walk on or over                                      
                
                    
        b
    
          
                                          
              
          
                                                      : to walk or proceed along : follow                                      
              
                             
treading a fine line between tradition and innovation
                         
                
                    4
                    
                                          
              
          
                                                      : to copulate with                                      
                
                  —used of a male bird
    
                
                    
1
                    
                                          
              
          
                                                      : to move or proceed on or as if on foot                                      
              
                             
must tread lightly
                         
                
                    2
                    
        a
    
          
                                          
              
          
                                                      : to set foot                                      
              
                             
has gone where others fear to tread
                         
                
                    
        b
    
          
                                          
              
          
                                                      : to put one's foot : step                                      
              
                             
carelessly treading on the flowers
                         
                
                    3
                    
                                          
              
          
                                                      : copulate                                      
                
                    
                                                      treader
                                      noun
                                                                            
    1
                    
        a(1)
    
                
                                          
              
          
                                                      : the part of a wheel or tire that makes contact with a road or rail                                      
                
                    
        (2)
    
          
                                          
              
          
                                                      : the pattern of ridges or grooves made or cut in the face of a tire                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the part of a shoe or boot sole that touches the ground                                      
                
                                
            also                
          
                                                      : the pattern on the bottom of a sole                                      
            
            2
                    
        a
    
          
                                          
              
          
                                                      : the upper horizontal part of a step                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the width of such a tread                                      
                
                    
3
                    
                  4
                    
                                          
              
          
                                                      : a mark (something, such as a footprint or the imprint of a tire) made by or as if by treading                                      
                
                    
5
                    
                                          
              
          
                                                      : the distance between the points of contact with the ground of the two front wheels or the two rear wheels of a vehicle                                      
                
                    
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  Merriam-Webster unabridged




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