Definition of "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: go down in value

"Prices slumped."

verb: fall or sink heavily

"He slumped onto the couch."

verb: assume a drooping posture or carriage