- 减少，缩小；变轻；降低，减退：
Orders have been falling off lately;we must advertise more.
近来订货减少，我们必须加大广告力度。
Interest in the game has fallen off.
人们对这项运动的兴趣已经降低。
- (质量)下降，变坏；变瘦，(健康、精力等的)衰退：
The quality of these goods has fallen off since last year.
去年以来，这些货物的质量开始下降。
- 【航海学】(船)偏离航线，改变航向，背着风，转向下风处：
The leading boat fell off when the wind grew too strong.
风吹得太猛时，领头的船转向了下风。
- 从…落下，(从…)跌落(或下降)；落下；跌落：
When you are learning to ride a bicycle,you often fall off.
在你学骑自行车时，你常常会从车上摔下来。
- 离开，(朋友等)渐渐疏远；脱离，退出；背弃，背叛：
Some of their most loyal members have now fallen off.
他们一些最忠诚的会员现已经退出了。
His friends fell off one by one when he was in adversity.
在他身处逆境时，他的朋友一个接一个离他而去。
- (逐渐)消失，消亡，死亡，废弃：
That custom has fallen off.
那个风俗已经废弃了。
- (动物)失去对…的食欲：
His horse is falling off its hey.
他那匹马对干草没有胃口。
- 【军事】(飞机)侧降