Synonyms of flatline

flatline

verb

ˈflat-ˌlīn 

as in to die

to stop living

the patient was fading fast, and doctors expected him to flatline before the night was over

Synonyms & Similar Words

• die
• fall
• perish
• succumb
• disappear
• demise
• end
• expire
• fade
• pass (on)
• exit
• buy it
• depart
• pass away
• step out
• check out
• go
• drop
• croak
• decease
• part
• snuff it
• kick in
• kick off
• peg out
• pop off
• give up the ghost
• fail
• kick the bucket
• conk (out)
• bite the dust
• dry up
• consume
• predecease

Antonyms & Near Antonyms

• live
• breathe
• come to
• revive
• exist
• be
• linger
• flourish
• thrive
• subsist
• prosper

Example Sentences

Recent Examples of flatline

The star flatlined twice and underwent a 10-hour surgery before he was put on an extracorporeal membrane oxygenation (ECMO) machine for a week. — Rachel Desantis, PEOPLE, 13 Aug. 2026

In the middle of all of this, after several Housewives franchises have been flatlining in recent years, a new addition has breathed life into the format and quickly garnered fans. — Mia Galuppo, HollywoodReporter, 12 Aug. 2026

Experts fear that surging Chinese overcapacity — stoked by flatlining domestic consumption — could further deepen the EU-China trade imbalance. — Mohammed Sergie, semafor.com, 29 July 2026

Enrollment is declining across the board in traditional public schools as the national birthrate continues to fall, charter school enrollment remains robust, private school voucher use increases and the number of immigrant students has flatlined. — Austin Horn july 3, Miami Herald, 3 July 2026