Quick definitions from WordNet (slump)
▸ noun: a noticeable deterioration in performance or quality ("The team went into a slump")
▸ noun: a long-term economic state characterized by unemployment and low prices and low levels of trade and investment
▸ verb: fall heavily or suddenly; decline markedly
▸ verb: fall or sink heavily ("He slumped onto the couch")
▸ verb: assume a drooping posture or carriage
▸ verb: go down in value ("Prices slumped")
▸ Also see slump
▸ noun: a noticeable deterioration in performance or quality ("The team went into a slump")
▸ noun: a long-term economic state characterized by unemployment and low prices and low levels of trade and investment
▸ verb: fall heavily or suddenly; decline markedly
▸ verb: fall or sink heavily ("He slumped onto the couch")
▸ verb: assume a drooping posture or carriage
▸ verb: go down in value ("Prices slumped")
▸ Also see slump