as in dying
to stop living
the patient was fading fast, and doctors expected him to flatline before the night was over
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Recent Examples of flatlining
Neuromodulation is necessary for keeping the brain’s activity level in a functional range, preventing it from either flatlining or erupting in seizures.
—
Ingrid Wickelgren, Quanta Magazine, 30 Jan. 2026
The episode ends with Monty flatlining in the hospital as Cami and their daughters cry for him.
—Randall Colburn, Entertainment Weekly, 4 Nov. 2025
The rest are flatlining or folding entirely.
—Alexander Puutio, Forbes.com, 8 Aug. 2025
Despite a global pandemic flatlining the music industry, Hynes contributed to albums by Lorde and Turnstile, crafted film scores for Passing and Master Gardener, and just last year penned some original music for the Broadway play Job.
—Mackenzie Cummings-Grady, Billboard, 3 Sep. 2019
Ingrid Wickelgren, Quanta Magazine, 30 Jan. 2026
The episode ends with Monty flatlining in the hospital as Cami and their daughters cry for him.
—Randall Colburn, Entertainment Weekly, 4 Nov. 2025
The rest are flatlining or folding entirely.
—Alexander Puutio, Forbes.com, 8 Aug. 2025
Despite a global pandemic flatlining the music industry, Hynes contributed to albums by Lorde and Turnstile, crafted film scores for Passing and Master Gardener, and just last year penned some original music for the Broadway play Job.
—Mackenzie Cummings-Grady, Billboard, 3 Sep. 2019
Recent Examples of Synonyms for flatlining
Verb
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The least massive stars take an enormous amount of time to burn through their fuel, living as red dwarfs and dying as white dwarfs, before fading away to black after roughly a quadrillion years pass.—
Big Think,
Big Think,
11 Feb. 2026
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Closer proximity of cytotoxic T cells with dying brain tumor cells was associated with longer patient survival after treatment.—
Rick Sobey,
Boston Herald,
11 Feb. 2026
Verb
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Two months later, the appointment of another nominee, Keith Fountain, failed in a 5-4 decision of the Board of Directors, falling one short of the six votes necessary to confirm him.—
Joseph Flaherty,
Arkansas Online,
11 Feb. 2026
-
Try to find a place that will block blowing or falling debris.—
CA Weather Bot,
Sacbee.com,
10 Feb. 2026
Cite this Entry
“Flatlining.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/flatlining. Accessed 14 Feb. 2026.
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