Synonyms for slump

a noticeable deterioration in performance or quality (noun)

• slack
• drop-off
• falloff

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

• depression

assume a drooping posture or carriage (verb)

• slouch

fall or sink heavily (verb)

• sink

fall heavily or suddenly (verb)

go down in value (verb)

• decline
• correct