fall heavily or suddenly; decline markedly
appear to move downward
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
fall or descend to a lower place or level
a covered cistern; waste water and sewage flow into it
go under
pass into a specified state or condition
fall or sink heavily
embed deeply
descend into or as if into some soft substance or place
cause to sink
plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe
(technology) a process that acts to absorb or remove energy or a substance from a system
