# flatline

> English word · Noun · IPA /ˈflætˌlaɪn/ · frequency rank #62,898

## Definitions
1. An asystole; the absence of heart contractions or brain waves.
2. An asystole; the absence of heart contractions or brain waves.
3. An unchanging state, as indicated in a graph of a variable over time.
4. A line that is run low to the water from the rod tip, generally off a release clip of some type.

## Etymology
From flat + line. Refers to a continuous straight line (asystole) on an ECG (EKG) or EEG, indicating death.

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