1dust 
/ˈdʌst/ noun
/ˈdʌst/ noun [noncount] 1 : fine dry powder that builds up inside buildings on surfaces that have not recently been cleaned
▪ The floor was covered with dust. ▪ You can see the dust particles floating through the air. ▪ There is not a speck of dust in that house. ◊Something that is collecting/gathering dust is not being used.
▪ The book just sat on the shelf gathering dust. 2 : fine powder made up of very small pieces of earth or sand
▪ As the car sped down the dirt road, it left a cloud of dust behind. ▪ The wind kicked up dust. [=blew dust into the air] 3 : fine powder made from a particular substance
▪ coal/gold dust ▪ He wiped the chalk dust off his hands. — see also sawdust
▪ The floor was covered with dust. ▪ You can see the dust particles floating through the air. ▪ There is not a speck of dust in that house. ◊Something that is collecting/gathering dust is not being used.
▪ The book just sat on the shelf gathering dust.
▪ As the car sped down the dirt road, it left a cloud of dust behind. ▪ The wind kicked up dust. [=blew dust into the air]
▪ coal/gold dust ▪ He wiped the chalk dust off his hands. — see also sawdust
bite the dust — see 1bite
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
▪ He said, “Eat my dust!” as he jumped in his car and drove away. — often used figuratively ▪ They've left other companies eating their dust. [=they have gone far ahead of other companies]
▪ He said, “Eat my dust!” as he jumped in his car and drove away. — often used figuratively ▪ They've left other companies eating their dust. [=they have gone far ahead of other companies]
leave (someone) in the dust
US, informal : to go far ahead of (someone) : to be much more advanced than (someone)
▪ The company has left its competitors in the dust.
▪ The company has left its competitors in the dust.
the dust settles
— used to talk about what happens when things become clear or calm after a period of change or confusion ▪ I'll call you as soon as the dust settles from the move. [=as soon as I am not busy with moving] ▪ When the dust settled [=when the situation became less confusing] and the votes were recounted, she had won the election. ▪ You should let the dust settle before you make any big decisions.
