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

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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