Meaning of drop-off

(noun) 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"

a steep high face of rock; "he stood on a high cliff overlooking the town"; "a steep drop"

a change downward; "there was a decrease in his temperature as the fever subsided"; "there was a sharp drop-off in sales"