the.com/flatline
The moment the heartbeat monitor stops drawing mountains and starts drawing horizons.
means To register no vital activity, shown as a flat horizontal line on a monitor; figuratively, to stall completely.
from Born in mid-20th-century hospitals, where the electrocardiogram's lively peaks collapsing into one unbroken line meant cardiac arrest — flat line, flatline.
Sound effectThat long beep is asystole, the absence of rhythm.
Business slangSales, growth, and engagement can flatline too.
Not the endA flatline can sometimes be restarted, dramatically.