redline.
A drawing, document, etc. that has been marked for correction or modification.
Meaning & usage
A 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.
Where this word comes from
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).
To mark a drawing or document for correction or modification.
To operate a device at one or more redlines.
To operate a device at one or more redlines. To run an internal combustion engine to its maximum or maximum recommended speed.
To deny or complicate access to services (such as banking, insurance, or healthcare) to residents in specific, often racially determined, areas.
To achieve audio levels that will cause clipping (indicated by red in an audio meter).
Where this word comes from
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).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.