Daily Chinese Idiom Guessing Game
A once dead thing comes back to life or a bad situation reappears after being suppressed.
冷灰重新烧了起来。原比喻失势的人重新得势。现常比喻已经消失了的恶势力又重新活动起来。
《史记·韩长儒列传》狱吏田甲辱安国。安国曰‘死灰独不复燃乎？’”
The old conflict between the two families has died down, but we must be careful it doesn’t come back to life.