in your dreams! idiom humorous
做白日梦！（当别人说了一些你认为没可能发生的事情，你给对方的反应）
something you say to someone who has just told you about something they are hoping for, in order to show that you do not believe it will happen
Dave, buy you a car? In your dreams! 戴夫，给你买辆车？做你的白日梦吧！