verb
to spoil something:
A broken leg blighted her chances of winning the championship.
noun
something that has a bad effect on a situation, a person’s life or the environment （对局势、生活或环境）有害的事物，不利因素
His death cast a blight on the whole of that year.
他的死使那一整年都处在阴影之中。
urban blight (= areas in a city that are ugly or not cared for well)
城市里环境脏、乱、差的地区