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