cascade

rush down in big quantities, like a cascade

a sudden downpour (as of tears or sparks etc) likened to a rain shower

“a sudden cascade of sparks”

arrange (open windows) on a computer desktop so that they overlap each other, with the title bars visible

a small waterfall or series of small waterfalls

a succession of stages or operations or processes or units

“progressing in severity as though a cascade of genetic damage was occurring”