英 [ˈfɔːl ɒf]
（船）偏离航向：指船只偏离了船头指向的方向。
（趋势）下降，减少：指某种趋势或情况逐渐减少或变差。
fall off // [ falling fell fallen falls ]
动词词组 If something falls off, it separates from the thing to which it was attached and moves toward the ground. 脱落
When your exhaust pipe falls off, you have to replace it.
当你的排气管脱落时，你只能更换它。
动词词组 If the degree, amount, or size of something falls off, it decreases. 降低; 减小
Unemployment is rising again and retail buying has fallen off.
失业率又在上升，而零售购买量已经减少。
(船)偏离航线，改变航向，背着风，转向下风处：
(飞机)侧降
... fall in with符合，与…一致；碰见，不期而遇 fall off减少；缩小；跌落，下降；衰退，变坏 fall out争吵；结果是 ...
... Fail-safe有故障保护的 Fall off下降，减少，变坏 Fan belt风机传动带 ...
...园，飞机的翅膀梁，必须有一个适当的融合材料，尺寸和紧固件生产等 Technical Product Manager » 技术产品经理 fall off » 脱落 ..
... only和不定式连用常构成结果状语，表示与预料相反的结果，意思是“竟然……、结果……”。如： turn out结果是, 原来是 fall off减少 ...
It's important to tighten up the wheels properly, otherwise they vibrate loose and fall off.
把车轮拧紧很重要，否则它们会振动而松脱。
In 'come back', 'break down' and 'fall off', 'back', 'down' and 'off' are all adverbial particles.
在come back、break down和fall off中，back、down和off都是副词小词。
Slow down, or you'll fall off!
慢点，不然会摔下地的！
The glassblower must turn the pipe constantly so that the thick liquid glass does not fall off the end.
VOA : special.2009.09.16
People are always losing a wooden leg and having parts of their limbs fall off.
人们不是丢失了一条木腿,就是缺胳膊少腿的。
1945年后的美国小说课程节选 : 耶鲁公开课
Eventually you develop a scab, as it healed, and then it would--and then the scab would fall off, and you'd be left with a scar.
愈合之后会变成一个疤,这个疤后来会脱落,你身上会留下疤痕
生物医学工程探索课程节选 : 耶鲁公开课
Stalactites have to hang on "tight" to the ceiling or they might fall off.
VOA : special.2011.04.11
Stalactites have to hang on tight to the ceiling or they might fall off.
VOA : special.2009.12.07
Thanks to Weight Watchers and Zumba DVDs, the weight started to fall off, Robinson said.
If I can fall off one cliff, I should be able to fall off each cliff.
Meanwhile, the drastic decline of DB plan participants resulted in a fall off in PBGC funding.