event horizon(e·vent ho·ri·zon n. Astronomy a theoretical boundary around a black hole beyond which no light or other radiation can escape ¦ figurative any point of no return: We're nearing the event horizon of the presidential election. OAD. || If I'd really put the pedal to the metal, I'd have gone through this planet's event horizon and found myself in the middle of next week. Boris Johnson LEND ME YOUR EARS (2003) || It was as if a cosmic black hole had opened in the room behind us, just across the event horizon of its threshold. Pritchard, John NIGHT SISTERS || The team pinpoints the "fish event horizon" at the turn of the first millennium as "the ultimate origin of today's fishing crisis". NEW SCIENTIST (2004). CollinsAlexander Demidov)
