What does flatlining mean?
Flatlining describes a process that has stopped improving, growing, or changing and has settled into an unchanging, often disappointing, level. The expression is most common in business and economics, where it describes sales, prices, investment, or an entire economy that remains stagnant. It carries a distinctly negative implication: stability achieved without recovery is not treated as progress. The word also has a clinical sense, describing a heart whose electrical activity has ceased and appears as a flat line on an electrocardiogram. In ordinary discussion, flatlining therefore suggests stasis, decline, or collapse rather than healthy stability. The construction is typically informal in economic commentary, while medical use is more technical but broadly understood. Used before a noun, it functions as a participial modifier, making it especially useful for describing growth or performance that has stalled.
verbTo stop changing and remain at a low or unchanging level, especially of sales, prices, or an economy; also, of a heart, to cease beating.
- To stop improving, growing, or changing and remain at a low or unchanging level, especially of sales, prices, or an economy.
- Of a heart, to cease beating, with its electrical activity shown as a flat line on an electrocardiogram.
"After a brief surge, demand began flatlining at a level too low to support the new plant."
"After a brief surge, demand began flatlining at a level too low to support the new plant."
"The patient's heart rhythm flatlined seconds later, and the resuscitation team moved into position."
A flat ECG line is literal in medicine and metaphorical in business: both describe activity that has ceased to move.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does flatlining come from?
Flatlining is an English compound formed from the established words flat and line, probably in the twentieth century. It began in medical usage, referring to the flat trace produced by a heart whose electrical activity had ceased, and was later extended figuratively to economic and other activity that remains level. The compound joins two separate English words rather than deriving from one inherited root; words such as flatten and flatness belong to the related flat family.
Related word forms
How flatlining is actually used
In business and economics, the term is usually informal and strongly negative, implying stagnation rather than healthy stability. Its medical use is more technical but widely understood. Before a noun, the present participle can function as a modifier.