bù jué rú dài
形容局势危急,象差点兒就要断掉的带子一样。
《史记•袁盎晁错列传》:“方吕后时,诸吕用事,擅相王。刘氏不绝如带。”
不绝如带作谓语、定语;用于危急时
continue in a situation as feeble as a thin thread