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1. Oxford American Dictionary

   nail something down

   • ph.
     fasten something securely with nails；identify something precisely
2. • 釋義

   ph.

   片語

   • 1. fasten something securely with nails
   • 2. identify something precisely
   • 3. secure something, especially an agreement
3. • 更多解釋

   nail something down

   • ph.
     identify something precisely

   Oxford Dictionary