say it: DRAH-pawf
drop-off is a noun meaning "a noticeable deterioration in performance or quality". It carries 3 recorded senses.
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”
Definitions, synonyms and semantic relations for drop-off come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.