1
                    
                                          
              
          
                                                      : an iced drink containing liquor (such as whiskey) and water or a carbonated beverage (such as ginger ale) and served in a tall glass                                      
                
                    
2
                    
                                          
              
          
                                                      : a railroad signal for a train to proceed at full speed                                      
                
                    
            
              highballed; highballing; highballs            
        
    
                                
              
          
                                                      : to go at full or high speed                                      
              
                             
a highballing express train
                         
                
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  Merriam-Webster unabridged




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