Meaning

noun a noticeable deterioration in performance or quality

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

verb assume a drooping posture or carriage

originProbably of North Germanic origin: compare Danish slumpe (“to stumble upon by chance”), Norwegian slumpe (“happen by chance”), Norwegian slumpa (“happen by chance”), Swedish slumpa (“randomize; to sell off”), Swedish slump (“chance, randomness, happenstance”). Compare also German schlumpen (“to trail; draggle; be sloppy”), dialectal Dutch slompen (“to walk clumsily”).

Etymology from Wiktionary, CC BY-SA 3.0