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dust (n.)

"fine, dry particles of earth or other matter so light that they can be raised and carried by the wind," Old English dust, from Proto-Germanic *dunstaz (source also of Old High German tunst "storm, breath," German Dunst "mist, vapor," Danish dyst "milldust," Dutch duist), from PIE *dheu- (1) "dust, smoke, vapor" (source also of Sanskrit dhu- "shake," Latin fumus "smoke").

Meaning "elementary substance of the human body, that to which living matter decays" was in Old English, hence, figuratively, "mortal life." Sense of "a collection of powdered matter in the air" is from 1570s. Dust-cover "protective covering to keep dust off" is by 1852; dust-jacket "detachable paper cover of a book" is from 1927. To kick up the (or a) dust "cause an uproar" is from 1753, but the figurative use of dust in reference to "confusion, disturbance" is from 1560s. For bite the dust see bite (v.).

dust (v.)

c. 1200, "to rise in the air as dust;" later "to sprinkle with dust" (1590s) and "to rid of dust" (1560s); from dust (n.). Related: Dusted; dusting. Sense of "to kill" is U.S. slang first recorded 1938 (compare bite the dust under dust (n.)).

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Definitions of dust from WordNet
1
dust (v.)
remove the dust from;
dust the cabinets
dust (v.)
rub the dust over a surface so as to blur the outlines of a shape;
The artist dusted the charcoal drawing down to a faint image
dust (v.)
cover with a light dusting of a substance;
dust the bread with flour
Synonyms: 
dust (v.)
distribute loosely;
Synonyms: scatter / sprinkle / dot / disperse
2
dust (n.)
fine powdery material such as dry earth or pollen that can be blown about in the air;
the furniture was covered with dust
dust (n.)
the remains of something that has been destroyed or broken up;
Synonyms: debris / junk / rubble / detritus
dust (n.)
free microscopic particles of solid material;
astronomers say that the empty space between planets actually contains measurable amounts of dust
From wordnet.princeton.edu