1
                    
        a
    
          
                                          
              
          
                                                      : something thrown into a scale to bring the weight to a desired value                                      
                
                    
        b
    
          
                                          
              
          
                                                      : something of little independent value thrown in to fill a gap                                      
                
                    
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  Merriam-Webster unabridged




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