dead as a doornail
死得彻底，毫无生命迹象
口语·强调彻底死亡
英文释义
completely lifeless or inanimate; beyond the point of no return; unmistakably and irrevocably dead
例句
After the power outage, my phone was dead as a doornail.
典故来源
源自14世纪，门钉被反复敲打固定后无法再使用，比喻完全失去生命或功能，莎士比亚在《亨利六世》中使用过。