chicken out

• [美国俚语]因胆小而放弃，因害怕而停止做某事：

  The boy chickened out of climbing up the tree.

  男孩胆怯了，不敢爬上这棵树。

  He chickened out when he learned that a supply of loaded guns was going along with them.

  当他得知有一批装了子弹的枪支跟他们在一起时，他就吓得离开了。