1. 缺乏的;不足的;供不应求的
If something is scarce, there is not enough of it.
e.g. Food was scarce and expensive...
食物供不应求，而且价格昂贵。
e.g. Jobs are becoming increasingly scarce.
工作机会越来越少。
2. (通常为避开难事或僵局)躲开，溜走，回避
If you make yourself scarce, you quickly leave the place you are in, usually in order to avoid a difficult or embarrassing situation.
e.g. It probably would be a good idea if you made yourself scarce.
你最好回避一下。