Etymology
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shoe (n.)
Old English scoh "shoe," from Proto-Germanic *skokhaz (source also of Old Norse skor, Danish and Swedish sko, Old Frisian skoch, Old Saxon skoh, Middle Dutch scoe, Dutch schoen, Old High German scuoh, German Schuh, Gothic skoh). No known cognates outside Germanic, unless it somehow is connected with PIE root *skeu- "cover" (source also of second element in Latin ob-scurus).

Old plural form shoon lasted until 16c. Meaning "metal plate to protect a horse's hoof" is attested from late 14c. Distinction between shoe and boot (n.) is attested from c. 1400. To stand in someone's shoes "see things from his or her point of view" is attested from 1767. Old shoe as a type of something worthless is attested from late 14c.

Shoes tied to the fender of a newlywed couple's car preserves the old custom (mentioned from 1540s) of throwing an old shoe at or after someone to wish them luck. Perhaps the association is with dirtiness, on the "muck is luck" theory.
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shoe (v.)
Old English scogan "to shoe," from the root of shoe (n.). In reference to horses from c. 1200. Related: Shoed; shoeing.
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shoe-shine (adj.)
1911, from shoe (n.) + shine (n.). One who shines shoes for money was a shoeblacker (1755).
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snow-shoe (n.)
also snowshoe, 1670s, from snow (n.) + shoe (n.). Related: Snowshoes.
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shoe-string (n.)
1610s, from shoe (n.) + string (n.). As figurative for "a small amount" it is recorded from 1882; as a type of necktie, from 1903; as a style of cooked potatoes from 1906.
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shoebox (n.)
1860, from shoe (n.) + box (n.). In reference to a type of building from 1968.
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shoehorn (n.)
1580s, from shoe (n.) + horn (n.); earlier shoeing-horn (mid-15c.).
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shoeless (adj.)
1620s, from shoe (n.) + -less. Related: Shoelessly; shoelessness.
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overshoe (n.)

also over-shoe, "a shoe worn over another," especially "an outer waterproof shoe," 1829, from over- + shoe (n.). Related: Overshoes.

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shod (adj.)
"wearing shoes," late 14c., from Middle English past participle of shoe (v.), surviving chiefly in compounds, such as roughshod, slipshod, etc.
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