These characters combine to create a powerful metaphor. 死灰 (sǐ huī), or “dead ashes,” represents something that appears completely finished, defeated, or inactive. 复燃 (fù rán), “to burn again,” signifies its unexpected and unwelcome return to life. The full idiom paints a picture of a problem once solved flaring up anew.
The idiom originates from the *Records of the Grand Historian* (史记), in a story about an official named Han Anguo (韩安国) during the Han Dynasty. After being imprisoned and humiliated, a warden mocked him. Han Anguo famously retorted, “Can dead ashes not burn again?” (死灰独不复燃乎?). He was predicting his own return to power, and indeed, he was later reinstated to a high position. Interestingly, while the origin story was about a personal, neutral comeback, the idiom's meaning has evolved over centuries. In modern Chinese, 死灰复燃 has an overwhelmingly negative connotation. It reflects a cultural vigilance and a certain pragmatic pessimism—the idea that bad things (ideas, habits, conflicts) are rarely ever truly gone and can re-emerge if conditions are right. A Western concept like “old habits die hard” is similar but narrower. 死灰复燃 can apply not just to personal habits but to large-scale phenomena like economic crises, political ideologies, or dormant conflicts. It's more dramatic and implies a more active “re-ignition” rather than just a lingering presence. It is the absolute opposite of a “phoenix rising from the ashes,” which symbolizes a glorious rebirth; 死灰复燃 symbolizes a dreadful recurrence.
This idiom is common in formal writing (news reports, essays) and spoken language when discussing serious issues. Its negative connotation is very strong.