noun
[noncount] fine dry powder that builds up inside buildings on surfaces that have not recently been cleaned
Something that is collecting/gathering dust is not being used.
fine powder made up of very small pieces of earth or sand
fine powder made from a particular substance
bite the dust
eat dust
US informal :to breathe the dust that has been raised into the air by the vehicle that is moving in front of you
leave (someone) in the dust
US informal :to go far ahead of (someone) :to be much more advanced than (someone)
the dust settles
used to talk about what happens when things become clear or calm after a period of change or confusion
verb
dusts; dusted; dusting
to make (something) clean by brushing or wiping dirt and dust from the surface [+ obj]
[+ obj] :to cover (something) with a fine powder
dust off
[phrasal verb]
dust (something) off or dust off (something) :to use (something) again after not using it for a long time