| 单词 | nail down | 
| 释义 | nail downphrasal verb  nailed down; nailing down; nails down   1   : to make (something, such as a victory) certain to happen  They need to score another touchdown to nail down the victory. 2   : to find out or identify (something) exactly  Her doctors haven't yet been able to nail down a diagnosis. They're trying to nail down the cause of our network problems. 3   : to make (something) definite or final  nail down a decision | 
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