Etymology
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shin (n.)
Old English scinu "shin, fore part of the lower leg," from Proto-Germanic *skino "thin piece" (source also of Dutch scheen, Old High German scina, German Schienbein "shin, shinbones"), from PIE root *skei- "to cut, split." Shin splints is attested from 1930.
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shin (v.)
"to climb by using arms and legs" (originally a nautical word), 1829, from shin (n.). Related: Shinned; shinning.
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shinny (v.)
"to climb a rope, pole, etc.," 1888, from use of shins and ankles to do so; see shin (n.). Earlier simply shin (1829). Related: Shinnied; shinnying.
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shinplaster (n.)

also shin-plaster, piece of paper soaked in vinegar and used to treat sore legs, from shin (n.) + plaster (n.). In U.S. history, a jocular phrase or term of abuse for "devalued low-denomination paper currency" (1824).

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chine (n.)

"spine, backbone," c. 1300, from Anglo-French achine, Old French eschine (11c., Modern French échine), a word of uncertain origin, perhaps from Germanic (compare Old English scinu "shinbone;" see shin).

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Shin Bet (n.)
Israeli security service, 1964, from Modern Hebrew shin + bet, names of the initial letters of sherut bitahon (kelali) "(general) security service."
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*skei- 
Proto-Indo-European root meaning "to cut, split," extension of root *sek- "to cut."

It forms all or part of: abscissa; conscience; conscious; ecu; escudo; escutcheon; esquire; nescience; nescient; nice; omniscience; omniscient; plebiscite; prescience; prescient; rescind; rescission; science; scienter; scilicet; sciolist; scission; schism; schist; schizo-; schizophrenia; scudo; sheath; sheathe; sheave (n.) "grooved wheel to receive a cord, pulley;" shed (v.) "cast off;" shin (n.) "fore part of the lower leg;" shingle (n.1) "thin piece of wood;" shit (v.); shive; shiver (n.1) "small piece, splinter, fragment, chip;" shoddy; shyster; skene; ski; skive (v.1) "split or cut into strips, pare off, grind away;" squire.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit chindhi, chinatti "to break, split up;" Avestan a-sista- "unsplit, unharmed," Greek skhizein "to split, cleave, part, separate;" Latin scindere "to cut, rend, tear asunder, split;" Armenian c'tim "to tear, scratch;" Lithuanian skiesti "to separate, divide;" Old Church Slavonic cediti "to strain;" Old English scitan, Old Norse skita "to defecate;" Old English sceað, Old High German sceida "sheath;" Old Irish sceid "to vomit, spit;" Welsh chwydu "to break open."
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Shinto (n.)
native religious system of Japan, 1727, from Chinese shin tao "way of the gods," from shin "god, gods, spirit" + tao "way, path, doctrine." Related: Shintoism.
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shinny (n.)
also shinney, primitive form of hockey, 1670s, perhaps from Gaelic sinteag "a bound, a leap." OED suggests origin from shin ye "the cry used in the game."
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greave (n.)
"metal armor to protect the front of the leg below the knee," c. 1300, from Old French greve "shin, armor for the leg" (12c.), of unknown origin. [Klein suggests it ultimately is from Egyptian Arabic gaurab "stocking, apparel for the leg."]
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