sell that man short这个短语的意思很像中国俗语“把人瞧扁了”，也就是没看到某人的长处。所以sell someone short意思就是“小看某人。”

　　例句:

　　Don't sell that man short. He's one of the smartest lawyers in town. You'd be wise to hire him if you're in trouble - he seldom loses a case.

　　这段话说：可别小看了这个人。他是城里最能干的律师之一。你要有麻烦找他才对.