[from cyberpunk SF, refers to flattening of EEG traces upon brain-death] (also adjectival flatlined). 1. To {die}, terminate, or fail, esp. irreversibly. In hacker parlance, this is used of machines only, human death being considered somewhat too serious a matter to employ jargon-jokes about. 2. To go completely quiescent; said of machines undergoing controlled shutdown. "You can suffer file damage if you shut down Unix but power off before the system has gone flatline." 3. Of a video tube, to fail by losing vertical scan, so all one sees is a bright horizontal line bisecting the screen.
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[Reference(s) to this entry by made by: {cyberpunk}{die}{science-fiction fandom}]