I was dusting in the bedroom when the phone rang.2 also dust down, dust off [transitive]DC to remove something such as dust or dirt from your clothes by brushing them with your hands: He got to his feet and dusted his knees. dust yourself (down/off) Corbett dusted himself down and walked off.3 [transitive] to put a fine powder over something dust something with something Dust the biscuits with ici