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- He staggered and fell, grasped vainly at the stone, and slid into the abyss.2.5 — Book 2 Chapter 5 — The Bridge of Khazad-dum (92% in)
- In the black abyss there appeared a single Eye that slowly grew. until it filled nearly all the Mirror.2.7 — Book 2 Chapter 7 — The Mirror of Galadriel (81% in)
There are no more uses of "abyss" in The Fellowship of the Ring.
Typical Usage (best examples)