any mild recession in the economy as a whole or in a particular industry.
11.
a period during which a person performs slowly, inefficiently, or ineffectively, especially a period during which an athlete or team fails to play or score as well as usual.
1677, "fall or sink into a muddy place," probably from a Scand. source, cf. Norw. and Dan. slumpe "fall upon," Swed. slumpa; perhaps ultimately of imitative origin. The noun meaning "heavy decline in prices on the stock exchange" is from 1888; generalized to "sharp decline in trade or business" 1922.