dirtfall means A cascade of falling dirt and accompanying debris; a landslide or avalanche. Lexicurio rates it Sui generis — a strength score of 100 out of 100.
Etymology
From dirt + fall, modelled after waterfall.
noun
- A cascade of falling dirt and accompanying debris; a landslide or avalanche.“Dirt and rocks cascade from above you. It's like a waterfall of dirt—a dirtfall!—and you cover your head and take a breath, bending forward in hopes of creating an air pocket for yourself. The dirtfall buries you.”