• (archaic) A guideline marked on a plate for a printing press.
  • A date on or before which something must be completed.

    "I must make this deadline or my boss will kill me!"

  • (archaic) A boundary around a prison, prisoners crossing which would be shot.
  • (archaic) A line that does not move.


  • (military) To render an item non-mission-capable; to ground an aircraft, etc.

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