Definition of flatline
1a : to register on an electronic monitor as having no brain waves or heartbeatb : die
2a : to be in a state of no progress or advancementb : to come to an end
Examples of flatline in a Sentence
the patient was fading fast, and doctors expected him to flatline before the night was over
Recent Examples of flatline from the Web
The inning would flatline in the next moments when Cuthbert bobbled a grounder at third base and threw wildly to first, allowing another run to score and everybody to be safe.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'flatline'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of flatline
Medical Definition of flatline
1: to register on an electronic monitor as having no heartbeart or brain waves : to experience cessation of heart contractions or brain wave activity as indicated by a flat line on a electrocardiogram or electroencephalogram I flatlined on the operating table, but Dr. Bunsom managed to revive me.—Alison Wright, Yoga Journal, May/June 2005 He used to be ill quite a bit as a younger child, and his heart flatlined four times before he was 6.—Ginnie Graham, Tulsa World, 19 Dec. 2007
2: die But just because death is expected doesn't mean it's any less depressing when the patient finally flatlines.—Phil Taylor, Sports Illustrated, 26 Jan. 2009
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