sink

fall or drop to a lower place or level

• “He sank to his knees”

cause to sink

• “The Japanese sank American ships in Pearl Harbor”

pass into a specified state or condition

• “He sank into Nirvana”

go under, "The raft sank and its occupants drowned"

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”

fall heavily or suddenly; decline markedly

• “The real estate market fell off”

fall or sink heavily

• “He slumped onto the couch”
• “My spirits sank”

embed deeply

• “She sank her fingers into the soft sand”
• “He buried his head in her lap”

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