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flatline

British  
/ ˈflætˌlaɪn /

verb

  1. to die or be so near death that the display of one's vital signs on medical monitoring equipment shows a flat line rather than peaks and troughs

  2. to remain at a continuous low level

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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But even the strongest sequences, like the opening scene where Teyana Taylor references her Oscar loss, filmed only a few months ago, can’t buoy those that flatline on arrival.

From Salon Jun. 11, 2026

You’re going up, up, up, and then you flatline.

From MarketWatch Mar. 18, 2026

As of Monday’s close, the stock was down 56% over the past 12 months, dragged down by fears that demand for its weight-loss drugs could flatline.

From Barron's Feb. 24, 2026

And revenue from both of these is trending down, causing the economy to flatline in 2025.

From The Wall Street Journal Jan. 15, 2026

Node:go root, Next:go-faster stripes, Previous:go flatline, Up:= G = go root vi.

From The Jargon File, Version 4.2.2, 20 Aug 2000 by Guy L. Steele

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