Sink (Noun)
Meaning 1
A depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof.
Classification
Nouns denoting natural objects (not man-made).
Synonyms
Hypernyms
Meaning 2
A covered cistern; waste water and sewage flow into it.
Classification
Nouns denoting man-made objects.
Synonyms
Hypernyms
Meaning 3
(technology) a process that acts to absorb or remove energy or a substance from a system; "the ocean is a sink for carbon dioxide".
Classification
Nouns denoting natural processes.