Definitions from Wiktionary (redline)

▸ noun:  A drawing, document, etc. that has been marked for correction or modification.
▸ noun:  The maximum speed, temperature, pressure, etc., at which a device (such as the engine in a car, aircraft, etc.) is designed to operate.
▸ verb:  To mark a drawing or document for correction or modification.
▸ verb:  To operate a device at one or more redlines.
▸ verb:  (automotive) To run an internal combustion engine to its maximum or maximum recommended speed.
▸ verb:  (Canada, US, urban studies) To deny or complicate access to services (such as banking, insurance, or healthcare) to residents in specific, often racially determined, areas.
▸ verb:  (audio engineering) To achieve audio levels that will cause clipping (indicated by red in an audio meter).
▸ Also see redline

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