plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe | a downward slope or bend |
a covered cistern; waste water and sewage flow into it | a gradual decrease; as of stored charge or current |
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof | change toward something smaller or lower |
(technology) a process that acts to absorb or remove energy or a substance from a system | a condition inferior to an earlier condition; a gradual falling off from a better state; decline |