| 词组 | dead as a doornail | 
| 释义 | dead as a doornailadj. phr.Completely dead without the slightest hope of resuscitation. 完全死了的;确实死了的。◆ This battery is dead as a doornail; no wonder your car won't start.蓄电池一点电也没有了;难怪你的汽车发动不起来。 | 
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