I didn't fall, but its sharp ridge caught my shoelace and broke it.

A sharp ridge rose up ahead of us and we began to climb it.

Though no coward, he has never yet shown any part of him but his back, which rises in a long sharp ridge.

Far away a sharp ridge cut off the horizon.

But he also knew that the gravity field ended at the sharp ridge ahead.

They stood on an upslope mounted with a sharp ridge.

Reaching the top, he had to move across a sharp ridge to get the base of the Pole.

Now Norman could see a sharp vertical ridge in the body.

I could feel the sharp ridge of rails below the water.

Another theorized original meaning is "hill with a sharp ridge".