mountain bike
noun
                                
              
          
                                                      : an all-terrain bicycle with wide knobby tires, straight handlebars, and typically 18 to 21 gears                                      
                
                    
                                                      mountain bike
                                      intransitive verb
                                                                            
    
                                                      mountain biker
                                      noun
                                                                            
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  Merriam-Webster unabridged




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