It was a skyless world, in which his eye; through dim gulfs of shadowy air, saw only ever-mounting slopes, great walls of stone behind great walls, and frowning precipices wreathed with mist.
Beyond it went a winding road that descended in many curves down to the narrow land under the shadow of Mindolluin’s precipice where stood the mansions of the dead Kings and of their Stewards.
But that shoulder, which rose to the height of the fifth wall, was hedged with great ramparts right up to the precipice that overhung its western end; and in that space stood the houses and domed tombs of bygone kings and lords, for ever silent between the mountain and the tower.
The eastern faces of the Ephel Duath were sheer, falling in cliff and precipice to the black trough that lay between them and the inner ridge.
Sam thought he saw a last fleeting glimpse of it, peering back over the edge of the eastward precipice, before it ducked and disappeared.
Its gate, upon the near south-eastern side, opened on a broad road, the outer parapet of which ran upon the brink of a precipice, until it turned southward and went winding down into the darkness to join the road that came over the Morgul Pass.
And they went up by steep ways, until they came to a high field below the snows that clad the lofty peaks, and it looked down over the precipice that stood behind the City.
There are no more uses of "precipice" in the book.
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She approached and then pulled back from the precipice.
She skied off a precipice, dropped her skis in midair, and then opened a parachute.