fall off

US /fɔːl ɔːf/
UK /fɔːl ɔːf/
"fall off" picture
1.

下降, 减少

to decrease in quantity or quality; to decline

:
Sales tend to fall off during the winter months.
冬季销量往往会下降
His performance has started to fall off recently.
他最近的表现开始下滑
2.

掉落, 脱落

to become detached or separated from something

:
The button fell off his shirt.
纽扣从他的衬衫上掉了下来
Be careful not to fall off the ladder.
小心不要从梯子上掉下来