redline

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).

• IPA^(key): /ˈɹɛd.laɪn/
• Rhymes: -ɛdlaɪn

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.

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 operate a device at one or more redlines.
   1. (automotive) To run an internal combustion engine to its maximum or maximum recommended speed.
3. (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.

   Antonym: greenline

   • 1995 September, Richard Barbrook, Andy Cameron, “The Californian Ideology”, in Mute‎, volume 1, number 3, →ISSN:

     Already ‘redlined’ by profit-hungry telcos, the inhabitants of poor inner city areas can be shut out of the new on-line services through lack of money.

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

• redlining
• sundown town

• redline on Wikipedia.Wikipedia
• redlining on Wikipedia.Wikipedia

• Nile red, relined