1. stand idle : 袖手旁观；
2. lie idle : 被搁置不用；
形容词
及物动词
不及物动词
1. 无事可做的;闲散的
If people who were working are idle, they have no jobs or work.
2. (机器、工厂等)闲置的
If machines or factories are idle, they are not working or being used.
3. 懒散的;懒惰的;无所事事的
If you say that someone is idle, you disapprove of them because they are not doing anything and you think they should be.
1. the state of an engine or other mechanism that is idling
e.g. the car engine was running at idle