Etymology
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silver (n.)

Old English seolfor, Mercian sylfur "silver; money," from Proto-Germanic *silabur- (source also of Old Saxon silvbar, Old Frisian selover, Old Norse silfr, Middle Dutch silver, Dutch zilver, Old High German silabar, German silber "silver; money," Gothic silubr "silver"), which is of uncertain origin.

It seems to be Germanic/Balto-Slavic (source also of Old Church Slavonic s(u)rebo, Russian serebro, Polish srebro, Lithuanian sidabras "silver"), but has long been presumed to be a Wanderwort (a loan-word that has spread among several languages) displacing the usual IE word for the metal (represented by Latin argentum; see argent).

Basque zilharr "silver" usually is considered a loan-word from West Germanic, but the Germanic form lately has been compared to old Celtic words used in Spain, and because the rest of Celtic uses the argentum word, this suggests the borrowing might be in the other direction, and Germanic word might be from "a Hispano-Celtic innovation due to an Iberian donor language. In this connection, the old comparison of Basque zilharr is attractive" [Boutkan].

As an adjective from late Old English (also silvern). As a color name from late 15c. Of voices, words, etc., from 1520s in reference to the metal's pleasing resonance; silver-tongued is from 1590s. The silver age (1560s) was a phrase used by Greek and Roman poets. Chemical abbreviation Ag is from Latin argentum "silver."

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silver (v.)
"to cover or plate with silver," mid-15c., from silver (n.). Meaning "to tinge with gray" (of hair) is from c. 1600. Related: Silvered; silvering.
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silversmith (n.)
Old English seolfursmið; see silver (n.) + smith (n.).
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silvery (adj.)
late 14c., from silver (n.) + -y (2). Related: Silveriness.
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silvern (adj.)
Middle English silveren, from Old English seolfren "made of silver;" see silver (n.) + -en (2). Similar formation in German silbern, Dutch zilveren. Fallen from use in English except in poetry.
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silverfish (n.)
1703, in reference to various types of silver-colored fish (similar formation in German Silberfisch, Dutch zilvervisch); from silver (adj.) + fish (n.). In reference to a type of household insect damaging to books, wallpaper, etc. (also known as silvertail and furniture-bug), it is attested from 1855.
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silver lining (n.)

a "bright side" which proverbially accompanies even the darkest trouble; by 1843, apparently from oft-quoted lines from Milton's "Comus," where the silver lining is the light of the moon shining from behind the cloud.

Was I deceived? or did a sable cloud
Turn forth her silver lining on the night?
I did not err, there does a sable cloud,
Turn out her silver lining on the night
And casts a gleam over this tufted grove.

To which Thomas Warton added the commentary: "When all succour ſeems to be lost, Heaven unexpectedly presents the ſilver lining oſ a ſable cloud to the virtuous."

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Silver Star 
U.S. military decoration awarded for gallantry in action, originally (1918) a small badge worn on the ribbon of a campaign medal; as a distinct medal, it was established Aug. 8, 1932.
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silver screen (n.)
1921, originally in reference to movie house projection screens colored with metallic paint to be more reflective. Transferred sense of "movies generally" is attested from 1924.
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