Gorge, K'AN: dangerous place; hole, cavity, hollow; pit, snare, trap, grave, precipice; critical time, test; risky. The ideogram: earth and pit.
This passage establishes Gorge as the primary hexagram image of unavoidable danger, defining it etymologically and symbolically as a hollow threshold requiring full, unreserved engagement.
, I Ching: The Classic Chinese Oracle of Change, 1994thesis