event horizon
n. A major turning point; a point of no return.

Example Citation:
"As we sit on the brink of this 'event horizon' for equity markets, you should ask whether this 'black hole' we are entering will deliver us to a new dimension where bulls run freely, or will it tear the market, destroying what we've built up?"
—Don Wellenreiter, "Markets at brink of event horizon," Futures, October, 2000

Notes:
In physics, an event horizon is the boundary of a black hole. It's the point where the gravity of the black hole is so intense that not even light can escape.

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