Tiny dry particles of dirt or other matter that gather on surfaces or float in the air.
From Old English 'dūst', meaning 'powder' or 'fine particles'. It is related to older Germanic words for blowing or scattering small bits.
A lot of household dust is actually tiny bits of your skin and clothes, not just dirt. The phrase 'dust to dust' reflects the idea that everything eventually breaks down into tiny particles again.
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