slump

a noticeable deterioration in performance or quality; "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality"

a long-term economic state characterized by unemployment and low prices and low levels of trade and investment

assume a drooping posture or carriage

fall or sink heavily; "He slumped onto the couch"; "My spirits sank"

fall heavily or suddenly; decline markedly; "The real estate market fell off"

go down in value; "the stock market corrected"; "prices slumped"