Open English Wordnet
Nouns
(n)slump, slack, drop-off, falloff, falling offa 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” (n)cliff, drop, drop-offa steep high face of rock“he stood on a high cliff overlooking the town”,
“a steep drop” (n)decrease, lessening, drop-offa change downward“there was a decrease in his temperature as the fever subsided”,
“there was a sharp drop-off in sales”