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"
descend,
come down,
go down,
fall move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"
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Wiktionary
Substantiv
slump -
A heavy or helpless collapse; a slouching or drooping posture; a period of poor activity or performance, especially an extended period.