Flatliner vs. Flatline: What's the Difference?

Flatliner and Flatline Definitions
Flatliner
(rare) A patient with no heartbeat.
Flatline
To show a horizontal line on the monitor of an electrocardiogram or an electroencephalogram, indicating no electrical activity.
Flatline
(Informal) To die.
Flatline
To be in an unchanging condition
Participation in civic activities has flatlined in recent years.
Flatline
Being or relating to an electrocardiogram or an electroencephalogram that indicates no electrical activity.
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Flatline
An unchanging state, as indicated in a graph of a variable over time.
Flatline
Asystole; the absence of heart contractions or brain waves.
Flatline
The disappearance of the rhythmic peaks displayed on a heart monitor.
Flatline
The disappearance of brain waves on an electroencephalogram.
Flatline
To stop beating.
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Flatline
To die.
Flatline
To kill.
Flatline
To stay at the same level, without development; or, to fall.