"To make a joke about someone" 或 "To tell a joke at someone's expense" 是笑话某人的英文表达方式。

这种说法源于英语中的 "joke" 和 "at someone's expense" 的结合。 "Joke" 指的是幽默的言论或行为，而 "at someone's expense" 指的是以某人为代价。因此，"to make a joke about someone" 或 "to tell a joke at someone's expense" 意味着利用某人的局面或处境来取笑或开玩笑。

例句:

"He always makes jokes at his sister's expense." (他总是以他妹妹为代价开玩笑。)
"I don't think it's funny to make jokes about someone's physical appearance." (我认为以某人的外貌为笑柄并不好笑。)
"It's not okay to tell jokes at someone else's expense, especially if it hurts their feepngs." (以别人为代价讲笑话是不对的，尤其是如果会伤害他们的感受。)