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.
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.
— synonyms: cesspool, cesspit, sump
verb fall or descend to a lower place or level.
— synonyms: drop, drop_down
verb cause to sink.
verb pass into a specified state or condition.
— synonyms: pass, lapse
verb go under.
— synonyms: settle, go_down, go_under
verb descend into or as if into some soft substance or place.
— synonyms: subside
verb appear to move downward.
— synonyms: dip
verb fall heavily or suddenly.
— synonyms: slump, fall_off
verb fall or sink heavily.
— synonyms: slump, slide_down