cavings

cavings

[′kāv·iŋz]
(engineering)
References in classic literature ?
The loose soil which had been put aside is then brought and rammed down firmly, to prevent its caving in, and is frequently sprinkled with water, to destroy the scent, lest the wolves and bears should be attracted to the place, and root up the concealed treasure.
And to port there loomed, like the caving in of one of the sides, a bulky mass with a slanting outline.