nail down

• • 用钉子钉住：

    The police broke up the window nailed down and rescued the boy from the fire.

    警察打碎了用钉子钉死的窗子，救出了大火中的男孩。

  • 使明确表态；确切说明(或解释)：

    All of his answers didn't nail me down.

    他根本就没对我的提问做出明确回答。

    The police at last nailed down the traffic accident.

    最后，警方就那次交通事故做出了确切的说明。

  • 使遵守诺言；使履行责任(或保证等)：

    I mentioned him to nail down his promise.

    我提醒他，叫他遵守自己的诺言。