What does "flatline" mean?
An asystole; the absence of heart contractions or brain waves.; The disappearance of the rhythmic peaks displayed on a heart monitor.
Flatline
/ˈflætˌlaɪn/ noun, verb, slang
noun, verb, slang ·Moderate ·College level
Meaning at a glance
- Primary sense: An asystole; the absence of heart contractions or brain waves.; The disappearance of the rhythmic peaks displayed on a heart monitor.
- Grammar: flatline is listed as noun, verb, slang.
- Nearest alternatives: asystole, die, plateaus, unchanged state.
- Useful contrasts: bobbing, mass uprising trend, pulse.
- Usage evidence: When brain function ceases, the electroencephalogram shows flatline recordings.
How to use "flatline"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "flatline" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "flatline" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "flatline" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "flatline" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "flatline" is acting as noun, verb, slang in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "asystole" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
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Final meaning check
Before publishing a sentence with "flatline", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 An asystole; the absence of heart contractions or brain waves.; The disappearance of the rhythmic peaks displayed on a heart monitor.
- 2 An asystole; the absence of heart contractions or brain waves.; The disappearance of brain waves on an electroencephalogram.
"When brain function ceases, the electroencephalogram shows flatline recordings."
- 3 An unchanging state, as indicated in a graph of a variable over time. also, figuratively
"Thus, you hear words like "flatline recession," "improvement at a greatly reduced rate," "economic hiccup," "recessionette," "rolling readjustment" and "the economy is double clutching.""
- 4 A line that is run low to the water from the rod tip, generally off a release clip of some type.
Verb
- 1 To stop beating. intransitive
- 2 To die. broadly, intransitive
- 3 To kill. slang, transitive
"If looks could kill, Mona's sharp gaze would have flatlined him in one second."
- 4 To remain at the same level, without development; or, to fall. informal, transitive
"The economy in Northern Ireland is flatlining and jobs are scarce."
- 5 To experience significantly decreased rates of change compared to previous rates of change.
"Upon upload, the video got 1,000 views/day for the first week, then flatlined and started getting fewer than ten views/day."
Show 1 more definition
- 6 To fish using a flatline. intransitive
Synonyms
All synonymsExample
"When brain function ceases, the electroencephalogram shows flatline recordings."
Common questions
What is a synonym for "flatline"?
Common synonyms include: asystole, die, plateaus, unchanged state.
How do you use "flatline" in a sentence?
When brain function ceases, the electroencephalogram shows flatline recordings.
How do you pronounce "flatline"?
Pronounced /ˈflætˌlaɪn/.
Etymology
From flat + line. Refers to a continuous straight line (asystole) on an ECG (EKG) or EEG, indicating death.