DICT.TW Dictionary Taiwan

 drop-off /ˈdrɑpˌɔf/
 陡坡

 drop-off
      n 1: 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" [syn: slump,
            slack, falloff, falling off]
      2: a steep high face of rock; "he stood on a high cliff
         overlooking the town"; "a steep drop" [syn: cliff, drop]
      3: a change downward; "there was a decrease in his temperature
         as the fever subsided"; "there was a sharp drop-off in
         sales" [syn: decrease, lessening] [ant: increase]