# redline

> English word · Noun · IPA /ˈɹɛd.laɪn/ · frequency rank #43,873

## Definitions
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.

## 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).

## Easily confused with
- **refine** (https://plainspell.com/en/vs/redline-vs-refine)
- **relive** (https://plainspell.com/en/vs/redline-vs-relive)
- **redone** (https://plainspell.com/en/vs/redline-vs-redone)
- **reeling** (https://plainspell.com/en/vs/redline-vs-reeling)
- **realize** (https://plainspell.com/en/vs/realize-vs-redline)
- **realise** (https://plainspell.com/en/vs/realise-vs-redline)
- **Redding** (https://plainspell.com/en/vs/redding-vs-redline)
- **redefine** (https://plainspell.com/en/vs/redefine-vs-redline)
- **recliner** (https://plainspell.com/en/vs/recliner-vs-redline)

## Common misspellings (10)
`erdline`, `rdeline`, `reddline`, `redilne`, `redlien`, `redlinne`, `redlline`, `redlnie`, `reldine`, `rredline`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/redline