redline

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Etymology

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

Pronunciation

• IPA: /ˈɹɛd.laɪn/

Noun

redline (plural redlines)

1. A drawing, document, etc. that has been marked for correction or modification.
2. The maximum speed, temperature, pressure, etc., at which a device (such as the engine in a car, aircraft, etc.) is designed to operate.

Verb

redline (redlines, present participle redlining; simple past and past participle redlined)

1. To mark a drawing or document for correction or modification.
2. To operate a device at one or more redlines.
   1. (automotive) To run an internal combustion engine to its maximum or maximum recommended speed.
3. (North America, urban studies) To deny or complicate access to services (such as banking, insurance, or healthcare) to residents in specific, often racially determined, areas.

   Antonyms: greenline

4. (audio engineering) To achieve audio levels that will cause clipping (indicated by red in an audio meter).

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