in BRIT, also use 英国英语亦用 dust down
1 PHRASAL VERB 重新采用（陈旧的方法）；把（旧物）备好待用 If you say that someone dusts something off or dusts it down, you mean they are using an old idea or method, rather than trying something new. 重新采用（陈旧的方法）；把（旧物）备好待用 [Also VERB n PREPOSITION]
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Critics were busy dusting down the same superlatives they had applied to their first three films. [VERB PREP. noun]
评论家们正忙着搬出他们用在前三部电影上的那些盛赞之词。
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Long-mothballed projects like widening the Suez Canal are being dusted off. [VERB PREP. noun (not pronoun)]
诸如拓宽苏伊士运河等长期束之高阁的计划正被重新采用。
2 PHRASAL VERB 重新振作 If you say that someone has dusted himself or herself off or dusted himself or herself down, you mean that they have managed to recover from a severe problem which has affected their life. 重新振作
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She dusted herself down and left to build her own career. [VERB pronoun-reflexive PREP.]
她重振旗鼓去开创自己的事业了。
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When we are rejected, although we have been hurt we can pick ourselves up, dust ourselves off and start again. [VERB pronoun-reflexive PREP.]
被拒绝的时候尽管我们很难过，但是我们会鼓起勇气,重新振作，从头再来。
3 PHRASAL VERB 除去…的灰尘;打扫 If someone dusts down something or dusts dirt off something, they remove dirt or dust from it. 除去…的灰尘;打扫
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He stood and dusted down his suit and folded the letter away. [VERB PREP. noun (not pronoun)]
他起身掸去了衣服上的灰尘并将信折起来收好。
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Use loose powder to set your makeup, dusting the excess off with a brush. [VERB noun PREP.]
用散粉来定妆,将多余的粉掸掉。