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

“the ocean is a sink for carbon dioxide”

a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof

a covered cistern; waste water and sewage flow into it

fall or descend to a lower place or level

“He sank to his knees”

cause to sink

“The Japanese sank American ships in Pearl Harbor”

“The men sink the boat”

pass into a specified state or condition; sink into

“He sank into nirvana”

go under

“The raft sank and its occupants drowned”

“They sink”

descend into or as if into some soft substance or place

“He sank into bed”

“She subsided into the chair”

appear to move downward

“The sun dipped below the horizon”

“The setting sun sank below the tree line”