dust something off
phrasal verb with dust verb uk/dʌst/ us/dʌst/
(UK also dust down)
（尤指长时间不用后拿出来）备好待用，整理
to prepare something for use, especially after it has not been used for a long time
It's time to dust off the old chemistry books and start studying. 现在应该把以前的化学书拿出来开始学习。
UK They brought out the old ambulances, dusted them down and put them back into service. 他们将旧救护车拿出来修复后再次投入使用。