Definition
When the quantity, rate, or quality of something diminishes, it is described as falling off.
下降；衰退
Every year, the number of students in the tutoring center falls off, reflecting a decline in educational demand.
每年，補習中心的學生人數都會減少，這反映了教育需求的下降。
Sales figures showed a significant fall off between quarters, which has raised our concerns.
銷售數據顯示季度之間有顯著的下降，這引起了我們的關注。
Our website traffic has fallen off recently, which might be related to market trends.
我們的網站流量最近有所下降，這可能與市場趨勢有關。