Online Etymology Dictionary

shutter-bug (n.): "enthusiastic amateur photographer," 1940, from shutter (n.) + bug (n.) in the "enthusiast" sense.
shuttle (n.): Old English scytel "a dart, arrow," from West Germanic *skutilaz (cf. Old Norse skutill "harpoon"), from Proto-Germanic *skut- "project" (see shoot). The weaving instrument so called (mid-14c.) from being "shot" across the threads. In some other languages, the machine takes its name from its resemblance to a boat (cf. Latin navicula, French navette, German weberschiff). Sense of "train that runs back and forth" is first recorded 1895, from image of the weaver's instrument's back-and-forth movement over the warp; extended to aircraft 1942, to spacecraft 1969.
shuttle (v.): 1550s, "move rapidly to and fro," from shuttle (n.); sense of "transport via a shuttle service" is recorded from 1930. Related: Shuttled; shuttling.
shuttlecock (n.): 1570s, from shuttle + cock (n.2).
shy (adj.): late Old English sceoh "shy," from Proto-Germanic *skeukh(w)az "afraid" (cf. Middle Low German schüwe, Dutch schuw, German scheu "shy;" Old High German sciuhen, German scheuchen "to scare away"). Uncertain cognates outside Germanic, unless in Old Church Slavonic scuti "to hunt, incite." Italian schivare "to avoid," Old French eschiver "to shun" are Germanic loan-words. The verb meaning "to recoil" first recorded 1640s.
shy (v.): "to throw with a jerk or toss," 1787, colloquial, of unknown origin and uncertain connection to shy (adj.).
shylock: "usurer," 1786, from Jewish money-lender character in Shakespeare's "The Merchant of Venice" (c.1596).
shyster: "unscrupulous lawyer," 1843, U.S. slang, probably altered from German Scheisser "incompetent worthless person," from Scheisse "shit," from Old High German skizzan "to defecate" (see shit).
si: "yes" in Italian, Spanish, Portuguese; from Latin sic "so" (see sic).
Siam: name of Thailand before 1939 and from 1945-48, from Thai sayam, from Sanskrit syama "dark," in reference to the relative skin color of the people.
Siamese: 1690s, "native of Siam;" the original Siamese twins (1829) were Chang and Eng (1814-1874), natives of Siam. Siamese cat is attested from 1871.
sib (n.): short for sibling, attested from 1957.
Siberia: region in northwestern Asia, the name said to come from Sibir, ancient Tatar fortress at the confluence of the rivers Tobol and Irtysh. As a typical place of miserable banishment, it is attested from 1841.
sibilant (adj.): 1660s, from Latin sibilantem (nominative sibilans), present participle of sibilare "to hiss, whistle," possibly of imitative origin (cf. Greek sizein "to hiss," Lettish sikt "to hiss," Old Church Slavonic svistati "to hiss, whistle"). The noun meaning "speech sound having a hissing effect" is from 1788.
sibling (n.): "brother or sister," 1903, modern revival (in anthropology) of Old English sibling "relative, kinsman," from sibb (adj.) "kinship, relationship; love, friendship," from Proto-Germanic *sebjo "blood relation, relative," properly "one's own" (cf. Old Saxon sibba, Old Frisian, Middle Dutch sibbe, Old High German sippa, German Sippe, Gothic sibja "kin, kindred"), from PIE s(w)e-bh(o)-, from root *swe- (see idiom). Related to the second element in gossip.
The word 'sib' or 'sibling' is coming into use in genetics in the English-speaking world, as an equivalent of the convenient German term 'Geschwister' [E.&C. Paul, "Human Heredity," 1930]
In Old English, sibb and its compounds covered grounds of "brotherly love, familial affection" which tended later to lump into love, e.g. sibsumnes "peace, concord, brotherly love," sibbian (v.) "bring together, reconcile," sibbecoss "kiss of peace."
sibyl (n.): c.1300, from Old French sibile, from Latin Sibylla, from Greek Sibylla, name for any of several prophetesses consulted by ancient Greeks and Romans, of uncertain origin. Said to be from Doric Siobolla, from Attic Theoboule "divine wish."
sibylline (adj.): 1570s, from Latin sibyllinus, from sibylla (see sibyl).
sic: insertion in printed quotation to call attention to error in the original, Latin, literally "so, thus," related to si "if," from PIE root *so- "this, that" (cf. Old English sio "she").
sic transit gloria mundi: c.1600, Latin, literally "thus passes the glory of the world;" perhaps an alteration of a passage in Thomas Á Kempis' "Imitatio Christi" (1471).
siccative (adj.): 1540s, from Late Latin siccativus "drying, siccative," from Latin siccatus, past participle of siccare "to dry," from siccus "dry," from PIE root *seikw- "to flow out" (cf. Avestan hiku- "dry," Greek iskhnos "dry, withered," Lithuanian seklus "shallow," Middle Irish sesc "dry," Sanskrit sincati "makes dry"). The noun is first recorded 1825.
sice (n.): "a roll of 6 in dice," late 14c., from Old French sis, from Latin sex (see six).
Sicily: island off the southern tip of Italy, from Latin Sicilia, from Greek Sikelia, from Sikeloi (plural) "Sicilians," from the name of an ancient people on the Tiber, whence part of them emigrated to the island that was named for them.
sick (v.): "set upon" (sick him!), 1845, dialectal variant of seek.
sick (adj.): "unwell," Old English seoc, from Proto-Germanic *seukaz, of uncertain origin. The general Germanic word (cf. Old Norse sjukr, Danish syg, Old Saxon siok, Old Frisian siak, Middle Dutch siec, Old High German sioh, Gothic siuks "sick, ill"), but in German and Dutch displaced by krank "weak, slim," probably originally with a sense of "twisted, bent" (see crank).

Meaning "having an inclination to vomit" is from 1610s; sense of "tired or weary (of something)" is from 1590s; phrase sick and tired of is attested from 1783. Meaning "mentally twisted" is from 1550s (though sense of "spiritually or morally corrupt" was in Old English), revived 1955. Sick joke is from 1958.
sick (n.): "those who are sick," Old English, from sick (adj).
sick-bay (n.): "forepart of a ship's main deck used as a hospital," 1580s, from sick (adj.) + bay (n.2), from the notion of a recessed space.
sicken (v.): c.1200, "to become sick," originally the verb was simply sick (mid-12c.), from sick (adj.) + -en (1). Transferred sense of "to make sick" is recorded from 1690s. Related: Sickened; sickening.
sickening (adj.): "causing revulsion," 1789, from present participle of sicken. Related: Sickeningly.
sickle (n.): Old English sicol, probably a West Germanic borrowing (cf. Middle Dutch sickele, Old High German sihhila, Dutch sikkel, German Sichel) from Vulgar Latin *sicila, from Latin secula "sickle" (cf. Italian segolo "hatchet"), from PIE root *sek- "cut" (see section). Applied to curved or crescent-shaped things from mid-15c. Sickle-cell anemia is first recorded 1922.
sickly (adj.): mid-14c., from sick (adj.) + -ly (1). Related: Sickliness.
sickness (n.): Old English seocnesse; see sick (adj.) and -ness.
sicko (n.): 1977, from sick (adj.) in the mental sense + ending as in weirdo.
siddha: in Indian religion, "one who has attained perfection and bliss," 1846, from Sanskrit siddhah "accomplished, achieved, successful, possessing supernatural power, sorcerer, saint," related to sidhyati "reaches his goal, succeeds," sadhuh "right, skilled, excellent, a holy man."
side (n.): Old English side "flanks of a person, the long part or aspect of anything," from Proto-Germanic *sithon (cf. Old Saxon sida, Old Norse siða, Middle Dutch side, Old High German sita, German Seite), from adjective *sithas "long" (cf. Old English sid "long, broad, spacious," Old Norse siðr "long, hanging down"), from PIE root *se- "long, late" (see soiree). Original sense preserved in countryside.

Figurative sense of "position or attitude of a person or set of persons in relation to another" (cf. choosing sides) first recorded mid-13c. Meaning "music on one side of a phonograph record" is first attested 1936. Phrase side by side "close together and abreast" is recorded from c.1200. Restaurant phrase on the side "apart from the main dish" is attested from 1884, American English. Side-splitting "funny" is first attested 1860.
side (v.): "to cut into sides" (of meat), late 15c., from side (n.). Meaning "to support one of the parties in a discussion, dispute, etc.," is first attested 1590s, from side (n.) in the figurative sense; earlier to hold sides (late 15c.). Related: Sided; siding.
side effect: 1884, from side (adj.) + effect (n.). Medical use, with reference to medicines, is recorded from 1939.
side-saddle (n.): late 15c., from side (adj.) + saddle (n.).
sidebar (n.): "secondary article in a newspaper," 1948, from side (adj.) + bar (n.1).
sideboard (n.): "table placed near the side of a room," c.1300, from side (adj.) + board (n.1).
sideburns (n.): 1881, American English, alteration of burnsides (q.v).
sidekick (n.): "companion or close associate," 1906, shortened from side-kicker (1903, in an O.Henry story), American English, of unknown origin. Earlier terms were side-pal (1886), side-partner (1890).
sidelight (n.): c.1600, "light coming from the side," from side + light (n.). Meaning "incidental information on a subject" is attested from 1862.
sideline (n.): "lines marking the limits of playing area" (on a football field, etc.), 1862, from side (adj.) + line (q.v.). The figurative sense of "position removed from active participation" is attested from 1934 (because players who are not in the game stand along the sidelines). The verb meaning "put out of play" is from 1945.
sidelong (adv.): 1520s, alteration of Middle English sidlyng (see sidle), probably by influence of side + long.
sideman (n.): "supporting musician," 1936, from side (adj.) + man (n.).
sidenote (n.): 1776, from side + note (n.).
sidereal (adj.): 1630s, "of or pertaining to the stars," earlier sideral (1590s), from French sidereal (16c.), from Latin sidereus "starry, astral," from sidus (genitive sideris) "star, constellation," probably from PIE root *sweid- "to shine" (cf. Lithuanian svidus "shining, bright").
sideshow (n.): 1855, apparently a coinage of P.T. Barnum's, from side + show (n.).
sidestep (n.): 1789, from side (adj.) + step (n.). The verb is recorded from 1901; the figurative sense is attested from 1911.
sideswipe (v.): "to strike with a glancing blow," 1917, from side (adj.) + swipe (q.v.). The noun is first recorded 1917.