in. to die. (From the flatness of the line on an EEG monitor.)
It appeared that the patient flatlined during the night.She just grabbed at her chest and flatlined.
flatline
verb to die. An allusion to the flat line on a medical monitoring device that indicates death US, 1981
flatline
slang To die or come very close to death. The "flat line" in question is a straight, horizontal line on an electrocardiogram or electroencephalogram indicating a lack of heart or brain activity (as opposed to the peaks and valleys displayed as a result of measuring the vital signs of a living person). The patient flatlined and we were unable to resuscitate. Time of death was 18:56.
flatline
in. to die. (From the flatness of the line on an EEG monitor when the heart stops.) It appeared that the patient flatlined during the night.