: rubbed or spread on the body with a bottle that has a rolling ball set into its top                                      
              
                             
a roll-on deodorant
                         
                
                    
            
               plural roll-ons            
        
    
                                
              
          
                                                      : something (as deodorant) that is rubbed or spread on the body with a bottle that has a rolling ball set into its top                                      
              
                             
deodorants sold as roll-ons, sprays, or sticks
                         
                
                    
        British,  informal      
      
                                
                                
              
            
                  —used to say that one wants a time or event to come quickly
Roll on Friday. I can't wait for the weekend!
    
                
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  Merriam-Webster unabridged




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