steal someone's thunder idiom
抢先（某人）做；（尤指）抢了（某人）的成功机会（或风头）
to do what someone else was going to do before they do it, especially if this takes success or praise away from them
Sandy stole my thunder when she announced that she was pregnant two days before I'd planned to tell people about my pregnancy. 在我打算告诉大家我怀孕的消息之前两天，桑迪抢先宣布她怀孕了，抢了我的风头。