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can: vt. To abort a job on a time-sharing system. Used esp.
   when the person doing the deed is an operator, as in "canned from
   the console".  Frequently used in an imperative sense, as in
   "Can that print job, the LPT just popped a sprocket!"  Synonymous
   with gun.  It is said that the ASCII character with mnemonic
   CAN (0011000) was used as a kill-job character on some early OSes.
   Alternatively, this term may derive from mainstream slang
   `canned' for being laid off or fired.