n.

1. 李子；梅子[C]
   Plums are now in season.

   现在洋李上市了。

2. 李属植物[C]
3. （用于布丁等的）葡萄干[C]
4. 紫红色；青紫色[U]
5. 佳品；令人垂涎的东西（尤指待遇好的职位）；意外收获[C]
   His new job is a real plum.

   他的新工作是一个真正的美差事。

n.

1. an oval fleshy fruit which is purple, reddish, or yellow when ripe, containing a flattish pointed stone.
2. the tree bearing plums. [Prunus domestica and related species.]
3. a reddish-purple colour.
4. [usu. as modifier] informal something highly desirable:
   a plum job.