fall-off

fall-off
ˈfall-off (also ˌfalling-ˈoff British English) noun [singular]
a decrease in the level, amount, or number of something
   SYN  fall
   OPP  rise
    fall-off in
    a fall-off in profits

fall-offBrE /ˈfɔːl ɒf/ 🔊NAmE /ˈfɔːl ɔːf/ 🔊, /ˈfɔːl ɑːf/ 🔊 (BrE also , less frequent ˈfalling-off) noun [singular] ~ (in sth) a reduction in the number, amount or quality of sth （数量的）减少；（质量的）降低◆a recent fall-off in sales近来销售量的减少