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English definition of “dust”

dust

noun [U]  /dʌst/ us  
dry dirt in the form of powder that covers surfaces inside a building, or very small dry pieces of earth, sand, or other substances: The furniture was covered with dust.
dusty
adjective  /ˈdʌs·ti/ us  
Piles of dusty books lay on the floor.

dust

verb [I/T]  /dʌst/ us  
to remove dry dirt in the form of powder from a surface: [I/T] I was dusting (her desk) when I noticed the piece of paper.
Phrasal verbs
(Definition of dust from the Cambridge Academic Content Dictionary © Cambridge University Press)
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