precipice

I resolved to remove my tent from the place where it stood, which was just under the hanging precipice of the hill; and which, if it should be shaken again, would certainly fall upon my tent[…]

to stand on a precipice

In emailed comments supporting the new initiative, the laureate professor Noam Chomsky said: “Humans are marching towards a precipice. When we reach it, unthinkable catastrophe is inevitable. […]”

Another step, and you will fall down the precipice.

The climber stayed alert while climbing the precipice.

Daphnis frequently collected such of the sheep as had strayed, and if a goat ventured too near a precipice Chloe drove it back.