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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   gun
      <jargon> (ITS, from the ":GUN" command) To forcibly
      terminate a program or job (computer, not career).  "Some
      idiot left a background process running soaking up half the
      cycles, so I gunned it."
      Compare can.
      (1995-02-27)