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
verb: fall or sink heavily
"He slumped onto the couch."
verb: assume a drooping posture or carriage