heads-up
noun /ˌhedz ˈʌp/
  /ˈhedz ʌp/
 (especially North American English) (plural heads-up, heads-ups)
- heads-up (about something) a piece of information given in advance of something or as advice预先通知;预先劝告 - Send everyone a heads-up about the changes well in advance.把这些变化早早通知每个人。 
- Can anyone give me a heads-up about how to change the format?有人能告诉我如何改变格式吗? 
- This is a heads-up about the seminar this week.这是本周研讨会的预告。 
- His statement said that he was not given a heads-up about the FBI raid.他在声明中说,他没有得到联邦调查局突袭的警告。 
 
- Send everyone a heads-up about the changes well in advance.