grind away
phrasal verb
            
              ground away; grinding away; grinds away            
        
    1
                    
                                          
              
          
                                                      : to work or study in a steady, determined way                                      
              
                             
She was grinding away at her studies.
                         
                
                    2
                    
                                          
              
          
                                                      : to remove (a part of something) by rubbing something rough against it                                      
              
                             
He uses a special tool to grind away the stone.
                         
                
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  Merriam-Webster unabridged




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