switch·back
                    
                                                                                                              
                                                                                                                                  ˈswich-ˌbak 
                                                      
                                                          
            
                                
              
          
                                                      : a zigzag road, trail, or section of railroad tracks for climbing a steep hill                                      
                
                    
                                                      switchback
                                      adjective
                                                                            
    
            
              switchbacked; switchbacking; switchbacks            
        
    
                                
              
          
                                                      : to follow a zigzag course especially for ascent or descent                                      
              
                             
a trail that switchbacks
                         
                
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  Merriam-Webster unabridged




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