nail somebody/something ↔ down phrasal verbphr v informal a) DECIDEto reach a final and definite agreement or decision about something 最终确定，对…作出定论 Two days isn’t enough time to nail down the details of an agreement. 要把协议的所有细节都确定下来，两天的时间是不够的。
b) TELL/ORDER somebody TO DO something nail somebody down to force someone to say clearly what they want or what they intend to do 迫使某人表明意图nail somebody down to Before they repair the car, nail them down to a price. 修车前先让他们把价钱讲明白。
→ nail somebody/something ↔ down at nail2(4)