from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. asystole; the absence of heart contractions
- n. the disappearance of the rhythmic peaks displayed on a heart monitor
- v. (of the heart) to stop beating
- v. (by extension) to die
- v. To stay at the same level, without development; or, to fall.
flat + line. (Wiktionary)