1. Plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe Noun
2. (technology) a process that acts to absorb or remove energy or a substance from a system Noun
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 Noun
4. A covered cistern; waste water and sewage flow into it Noun
5. Fall or descend to a lower place or level Verb
6. Cause to sink Verb
7. Pass into a specified state or condition Verb
8. Go under Verb
9. Descend into or as if into some soft substance or place Verb
10. Appear to move downward Verb
11. Fall heavily or suddenly; decline markedly Verb