Definition
To be in a very dangerous or precarious situation, where a minor change could result in a negative or disastrous outcome.
千钧一发，危在旦夕
After months of negotiations, the success of the merger still hangs by a thread.
经过数月的谈判，合并的成功与否仍然岌岌可危。
The patient's life is hanging by a thread and requires close monitoring by the medical team.
病人的生命危在旦夕，需要医疗团队密切监控。
Many small companies' fates were hanging by a thread after the economic crisis broke out.
经济危机爆发后，许多小型公司的命运岌岌可危。