FluentPlex
输入任意形式的英语单词（went、children），或输入中文单词查找对应的英语。

nail down

动词
  1. to attach with nails (transitive) · Nail down the shelf, then paint it.
  2. to make something (e.g. a decision or plan) firm or certain (transitive) · They haven't nailed down their vacation plans yet.
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