hang by a thread
岌岌可危；处于极其危险或不确定的情况中
书面·形容极度危险或濒临失败
英文释义
to be in a precarious or dangerous situation; to be at risk of imminent failure or collapse
例句
After the scandal, his career was hanging by a thread. One more mistake and he's done.
典故来源
源自古希腊神话，达摩克利斯之剑用一根马鬃悬挂，象征随时可能降临的危险。