take to one's heels
逃之夭夭

例句：
When police arrived, the thieves had already taken to their heels.
当警察赶到时，小偷们已经逃之夭夭了。

tight-lipped
沉默，缄默

例句：
The company spokesperson remained tight-lipped about the arrangement for the takeover, and she refused to give out any information.
公司发言人对兼并一事的安排保持沉默，她拒绝提供任何信息。