redline
A drawing, document, etcA drawing, document, etc. that has been marked for correction or modification.
Meaning
2 sensesA drawing, document, etc. that has been marked for correction or modification.
The maximum speed, temperature, pressure, etc., at which a device (such as the engine in a car, aircraft, etc.) is designed to operate.
Origin
From red + line, originating with the frequent use of red pen or pencil to mark correctionFrom 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).
Wiktionary, CC BY-SA 4.0 · source
Dictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.