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Synonyms for Drop-off (same or very similar meaning)

WordNet sense 1 (a noticeable deterioration in performance or quality):
falloff, slack, slump, falling off

WordNet sense 2 (a steep high face of rock):
cliff, drop

WordNet sense 3 (a change downward):
decrease, lessening, decrease


From the ODE community, based on WordNetadd/edit