at it
idiom
                                
              
          
                                                      : doing some activity                                      
              
                             
I didn't expect her to have started working yet, but she was already (hard) at it when I arrived.
                                       My neighbors are always arguing, and they were at it again last night.
                         
                
                    Love words? Need even more definitions?
  
  Merriam-Webster unabridged




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