fall off

(noun) a noticeable deterioration in performance or quality. Synonyms: slump, slack, drop-off, falloff, falling off. Examples: "The team went into a slump." "A gradual slack in output." "A drop-off in attendance." "A falloff in quality."

(verb) come off. Synonyms: fall off. Example: "This button had fallen off."

(verb) fall heavily or suddenly; decline markedly. Synonyms: slump, fall off, sink. Example: "The real estate market fell off."

(verb) diminish in size or intensity. Synonyms: fall off, fall away.