Main entry: decrease, drop-off, lessening
Definition: a change downward
Usage: there was a decrease in his temperature as the fever subsided; there was a sharp drop-off in sales
Main entry: cliff, drop, drop-off
Definition: a steep high face of rock
Usage: he stood on a high cliff overlooking the town; a steep drop
Main entry: slack, slump, drop-off, falling off, falloff
Definition: a noticeable deterioration in performance or quality
Usage: the team went into a slump; a gradual slack in output; a drop-off in attendance; a falloff in quality