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