ˈsɛspɪt ˈsɛsˌpuːl læps sɪŋk sɪŋk slʌmp sʌbˈsaɪd sʌmp fall heavily or suddenly; decline markedly The real estate market fell off embed deeply She sank her fingers into the soft sand He buried his head in her lap descend into or as if into some soft substance or place He sank into bed She subsided into the chair pass into a specified state or condition; sink into He sank into nirvana 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 fall or sink heavily He slumped onto the couch My spirits sank go under The raft sank and its occupants drowned appear to move downward The sun dipped below the horizon The setting sun sank below the tree line a covered cistern; waste water and sewage flow into it plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof (technology) a process that acts to absorb or remove energy or a substance from a system the ocean is a sink for carbon dioxide