flatline.
An asystole; the absence of heart contractions or brain waves.
Meaning & usage
An asystole; the absence of heart contractions or brain waves. The disappearance of the rhythmic peaks displayed on a heart monitor.
An asystole; the absence of heart contractions or brain waves. The disappearance of brain waves on an electroencephalogram.
An unchanging state, as indicated in a graph of a variable over time.
A line that is run low to the water from the rod tip, generally off a release clip of some type.
Where this word comes from
From flat + line. Refers to a continuous straight line (asystole) on an ECG (EKG) or EEG, indicating death.
To stop beating.
To die.
To kill.
To remain at the same level, without development; or, to fall.
To experience significantly decreased rates of change compared to previous rates of change.
Upon upload, the video got 1,000 views/day for the first week, then flatlined and started getting fewer than ten views/day.
To fish using a flatline.
Where this word comes from
From flat + line. Refers to a continuous straight line (asystole) on an ECG (EKG) or EEG, indicating death.
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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.