government by a ruler or small group of people who have unlimited power over the people in their country or state and use it unfairly and cruelly

This, the president promised us, was a war against tyranny. 总统向我们许诺，这是一场反对暴政的战争。

a situation in which someone or something controls how you are able to live, in an unfair way

Women, the play seems to suggest, must resist the tyranny of domesticity. 这部戏似乎表明，妇女必须抵制家务的束缚。