Heads up

名词 heads up:

1. a warning message
   同义词：heads-up

动词 head up:

1. be the first or leading member of (a group) and excel
   同义词：head, head up

形容词 heads up:

1. fully alert and watchful
   同义词：heads-up, wide-awake

1. One of my jobs at the newspaper office was to head up the page before it was printed.
   我在报社有一项工作是报纸付印前给版面上加标题。
2. "Heads up!" said the waiter carrying the hot food.
   "当心！"端着热食物的男招待说。