n.[C]

1. 暴君；专制君主
   For years the country was ruled by a tyrant.

   这个国家被一个暴君统治了好多年。

2. 暴君似的人；专横的人
   Her grandfather was a tyrant who insisted on absolute silence at the dinner table.

   她祖父是个专横的人，坚持吃饭时绝对禁止讲话。

3. 严酷的事物，苛刻的事物
4. （古希腊的）僭主，僭王

n.

1. a cruel and oppressive ruler.
2. a person exercising power or control in a cruel and arbitrary way.
3. (especially in ancient Greece) a ruler who seized absolute power without legal right.