All 5 Uses

abyss
in
The Kill Order
(Auto-generated)

Mark rolled onto his stomach and inched his body over the lip of the opening, lowering his feet into the abyss while he held on to the edge.†
p. 155.4 *

abyss = a hole or dropoff so deep the bottom cannot be seen -- often used figuratively to imply a frightening bottomless pit
The walkway that encircled the abyss in the center chamber was about four feet wide, and as they inched along, it creaked and groaned.†
p. 157.2
In the relative darkness, the whole thing looked like some alien vessel rising from the abyss of the ocean.†
p. 197.8
An abyss yawned in his chest, threatening to swallow his heart.†
p. 273.9
The two strangers leaped into the abyss and vanished from sight.†
p. 322.3

Definitions:

(1) (abyss)
a hole or dropoff so deep the bottom cannot be seen -- often used figuratively to imply a frightening bottomless pit
(2) (meaning too rare to warrant focus)