sink

(noun) plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe.

(noun) (technology) a process that acts to absorb or remove energy or a substance from a system. Examples: "The ocean is a sink for carbon dioxide."

(noun) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof. Synonyms: sinkhole, swallow hole.

(noun) a covered cistern; waste water and sewage flow into it. Synonyms: cesspool, cesspit, sump.

(verb) fall or descend to a lower place or level. Synonyms: drop, drop down. Examples: "He sank to his knees."

(verb) cause to sink. Examples: "The japanese sank american ships in pearl harbor."

(verb) pass into a specified state or condition. Synonyms: pass, lapse. Examples: "He sank into nirvana."

(verb) go under, "The raft sank and its occupants drowned". Synonyms: settle, go down, go under.

(verb) descend into or as if into some soft substance or place. Synonyms: subside. Examples: "He sank into bed." "She subsided into the chair."

(verb) appear to move downward. Synonyms: dip. Examples: "The sun dipped below the horizon." "The setting sun sank below the tree line."

(verb) fall heavily or suddenly; decline markedly. Synonyms: slump, fall off. Examples: "The real estate market fell off."

(verb) fall or sink heavily. Synonyms: slump, slide down. Examples: "He slumped onto the couch." "My spirits sank."

(verb) embed deeply. Synonyms: bury. Examples: "She sank her fingers into the soft sand." "He buried his head in her lap."