Answer:
Talus has two definitions.
The first is of the bone (the large bone in the ankle that articulates with the tibia of the leg and the calcaneum and navicular bone of the foot).
Sentence: I went to the doctor, and he said my talus bone fractured.
The second is a sloping mass of rock fragments at the foot of a cliff.
Sentence: When I went hiking today, I had to climb up the talus of the mountain, and slipped a couple of times.
Hope this helps!