Flatliner vs. Flatline: What's the Difference?

(rare) A patient with no heartbeat.

To show a horizontal line on the monitor of an electrocardiogram or an electroencephalogram, indicating no electrical activity.

(Informal) To die.

To be in an unchanging condition

Being or relating to an electrocardiogram or an electroencephalogram that indicates no electrical activity.

An unchanging state, as indicated in a graph of a variable over time.

Asystole; the absence of heart contractions or brain waves.

The disappearance of the rhythmic peaks displayed on a heart monitor.

The disappearance of brain waves on an electroencephalogram.

To stop beating.

To die.

To kill.

To stay at the same level, without development; or, to fall.