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See also: red line


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A compound of red + line, recalling the frequent use of red pen or pencil to mark corrections on drawings and documents (1), and the red markings on a tachometer (2).



redline (plural redlines)

  1. A drawing, document, etc. that has been marked for correction or modification.
  2. The maximum speed at which the engine in a car is designed to operate.


redline (third-person singular simple present redlines, present participle redlining, simple past and past participle redlined)

  1. To mark a drawing or document for correction or modification.
  2. To run an internal combustion engine to its maximum or maximum recommended speed.
  3. To deny or complicate access to services (such as banking, insurance, or healthcare) to residents in specific, often racially determined, areas.