be / keep / stay one step ahead (of sb)a. to be better prepared for something or know more about something than someone else（比某人）领先一步，（比某人）准备更充分（了解更多）:•A good teacher is always at least one step ahead of his students.好教师应该始终比学生至少领先一步。b. to manage not to be caught by someone who is trying to find or catch you成功地躲避〔想要找到或抓到你的人〕 |