to kill someone by hanging them by the neck from a rope, usually as a punishment for a crime

He's one of those old-fashioned types who thinks criminals ought to be strung up. 他是那种老式思维的人，认为杀人犯都应该被绞死。

to punish someone severely

He ought to be strung up for what he said about his mother. 他那样说他母亲真该被严惩。

to tie or fix the ends of a long, thin object to two points that are high up, allowing the rest of it to hang freely

Let's string up a banner at the front of the house to welcome him home. 我们在房子前面挂上横幅欢迎他回家吧。