I take/plead the Fifth (Amendment) idiom US humorous
拒绝回答
something that you say in order to tell someone you are not going to answer a question
"So, who do you like best, Jenny or Kim?" "Sorry, I take the Fifth on that." “那么，你最喜欢谁？是珍妮还是金姆？”“对不起，我拒绝回答。”