- 让…下车；允许…下船(或下岸)：
The school bus stopped at the gate and let the pupils off.
校车停在大门口，让学生们下车。
- 原谅；释放；饶恕；从轻发落：
The teacher let that careless student off and didn't fail him.
老师放过了那个粗心的学生，没给他打不及格。
- 放(炮、烟火等)：
The teacher forbad the pupils to let off fireworks in the school.
老师禁止学生在学校放烟火。
- 允许不做某事，准许不工作，准许离去(如下班、放学等)；免除(责任、任务等)；放假：
The factory manager let the workers off for a week.
厂长给工人们放了一周的假。
I'll let her off the housework this weekend.
这个周末我免了她的家务活。
- (房屋)分层出租，分套出租；准许部分租用房屋：
These buildings are being let off as flats.
这些楼房是分套出租的。
- 漏出，渗出(水、气体等)：
We should let the steam off the boiler.
我们应该放掉锅炉里的蒸气。
- 讲(笑话)，说(俏皮话等)：
The speaker started his speech by letting off a joke.
演讲人在演说时先讲了一个笑话。
- 发泄，吐露
- [口语]放屁