露出头部；露面；活动起来to show one's head; to show one's face; to appear

• 不敢露头

  not dare to show one's face

• 他刚一露头，就被发现了。

  He was found out just as soon as he showed his face.

• 太阳还没有露头，大家就起来了。

  Before the sun had even appeared everyone had got up.

比喻刚出现to just appear