a heads-up警告；警示。這個詞是從更早以前的用法引申而來的。當時的Heads up.等同於Watchout.（小心，注意）常見於棒球或美式足球中。後來就以人抬頭注意情況來形容一個消息或警告。
看看老外聊天時怎麼用a heads-up：
Nick: Have you noticed that our sales have been dropping badly?
Dora: Is it because of the slow season?
Nick: No, I'm referring to the data from previous years.
Dora: Are you going to give a heads-
up to the department head?
Nick: I will. We have to increase sales, or some of us might be aid off.
尼克：你注意到我們的業績下滑得很厲害嗎？
多拉：是因為淡季的關係嗎？尼克：不是，我正在比對前幾年的數據。
多拉：你要不要提醒一下部門主管？
尼克：我會的，我們必須提高業績，不然可能有人會被裁掉。
a heads-up例句精選：
So shouldn't I, like, give him a heads-up or something?
我不應該給他點提醒什麼的嗎？
If we have to put our contingency plan into effect, we may want to give her a heads-up.
如果我們不得不施行應急計劃，我們可能要給她個提個醒。
I know, I know. sorry, I should have given you a heads-up.
不好意思。我是應該提前通知你的。
They gave us a heads-up that the deal might be off.
他們警告我們交易可能會取消。
拓展學習：
vigilant 警戒的
dictate 命令
cautious 謹慎的
attention 注意
take the rein 支配
ride herd on 照看；監管
in the saddle 處於控制地位