FluentPlex

redline

/ˈɹɛd.laɪn/ noun C2
  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.

Plural redlines

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.