shaft (n.1)youdaoicibaDictYouDict[shaft 词源字典]
Old English sceaft "long, slender rod, staff, pole; spear-shaft; spear," from Proto-Germanic *skaftaz (cognates: Old Norse skapt, Old Saxon skaft, Old High German scaft, German schaft, Dutch schacht, not found in Gothic), which some connect with a Germanic passive past participle of PIE root *(s)kep- "to cut, to scrape" (source of Old English scafan "to shave, scrape, polish") on notion of "tree branch stripped of its bark." But compare Latin scapus "shaft, stem, shank," Greek skeptron "a staff" (see scepter) which appear to be cognates.

Meaning "beam or ray" (of light, etc.) is attested from c. 1300. Sense of "an arrow" is from c. 1400; that of "a handle" from 1520s. Mechanical sense is from 1680s. Vulgar slang meaning "penis" first recorded 1719 on notion of "columnar part" (late 14c.); hence probably shaft (v.) and the related noun sense "act of unfair treatment" (1959), though some early sources insist this is from the notion of a "wound."[shaft etymology, shaft origin, 英语词源]
shaft (n.2)youdaoicibaDictYouDict
"long, narrow passage sunk into the earth," early 15c., probably from shaft (n.1) on notion of "long and cylindrical," perhaps as a translation of cognate Low German schacht in this sense (Grimm's suggestion, though OED is against it). Or it may represent a separate (unrecorded) development in Old English directly from Proto-Germanic *skaftaz if the original sense is "scrape, dig." The slang sense of shaft (n.1) is punned upon in country music song "She Got the Gold Mine, I Got the Shaft," a hit for Jerry Reed in 1982.
shaft (v.)youdaoicibaDictYouDict
"treat cruelly and unfairly," by 1958, perhaps from shaft (n.1) with overtones of sodomy. Related: Shafted; shafting.
shag (n.)youdaoicibaDictYouDict
1590s, "cloth having a velvet nap on one side," perhaps from Old English sceacga "rough matted hair or wool," from Proto-Germanic *skagjan (cognates: Old Norse skegg, Swedish skägg "beard"), perhaps related to Old High German scahho "promontory," Old Norse skagi "a cape, headland," with a connecting sense of "jutting out, projecting." But the word appears to be missing in Middle English. Of tobacco, "cut in fine shreds," it is recorded from 1789; of carpets, rugs, etc., from 1946.
shag (v.1)youdaoicibaDictYouDict
"copulate with," 1788, probably from obsolete verb shag (late 14c.) "to shake, waggle," which probably is connected to shake (v.).
And þe boot, amydde þe water, was shaggid. [Wyclif]
Compare shake it in U.S. blues slang from 1920s, ostensibly with reference to dancing. But compare shag (v.), used from 1610s in a sense "to roughen or make shaggy." Also the name of a dance popular in U.S. 1930s and '40s. Related: Shagged; shagging.
shag (v.2)youdaoicibaDictYouDict
in baseball, "to go after and catch" (fly balls), by 1913, of uncertain origin. Century Dictionary has it as a secondary sense of a shag (v.) "to rove about as a stroller or beggar" (1851), which is perhaps from shack (n.) "disreputable fellow" (1680s), short for shake-rag, an old term for a beggar.
shagbark (n.)youdaoicibaDictYouDict
type of hickory, 1751, from shag (n.) + bark (n.1).
shaggy (adj.)youdaoicibaDictYouDict
"rough, coarse, unkempt," 1590s, from shag (n.) + -y (2). Related: Shaggily; shagginess. Earlier was shagged, from Old English sceacgede "hairy;" compare Old Norse skeggjaðr, Danish skægget "bearded." The shaggy-dog story as a type of joke is attested from 1944, perhaps from vaudeville.
shah (n.)youdaoicibaDictYouDict
title of the king of Persia, 1560s, shaw, from Persian shah, shortened from Old Persian xšayathiya "king," from Indo-Iranian *ksayati "he has power over, rules" from PIE *tke- "to gain control of, gain power over" (cognates: Sanskrit ksatram "dominion;" Greek krasthai "to acquire, get," kektesthai "to possess"). His wife is a shahbanu (from banu "lady"); his son is a shahzadah (from zadah "son").
shake (v.)youdaoicibaDictYouDict
Old English sceacan "move (something) quickly to and fro, brandish; move the body or a part of it rapidly back and forth;" also "go, glide, hasten, flee, depart" (related to sceacdom "flight"); of persons or parts of the body, "to tremble" especially from fever, cold, fear" (class VI strong verb; past tense scoc, past participle scacen), from Proto-Germanic *skakanan (cognates: Old Norse, Swedish skaka, Danish skage "to shift, turn, veer"). No certain cognates outside Germanic, but some suggest a possible connection to Sanskrit khaj "to agitate, churn, stir about," Old Church Slavonic skoku "a leap, bound," Welsh ysgogi "move."

Of the earth in earthquakes, c. 1300. Meaning "seize and shake (someone or something else)" is from early 14c. In reference to mixing ingredients, etc., by shaking a container from late 14c. Meaning "to rid oneself of by abrupt twists" is from c. 1200, also in Middle English in reference to evading responsibility, etc. Meaning "weaken, impair" is from late 14c., on notion of "make unstable."

To shake hands dates from 1530s. Shake a (loose) leg "hurry up" first recorded 1904; shake a heel (sometimes foot) was an old way to say "to dance" (1660s); to shake (one's) elbow (1620s) meant "to gamble at dice." Phrase more _____ than you can shake a stick at is attested from 1818, American English. To shake (one's) head as a sign of disapproval is recorded from c. 1300.
shake (n.)youdaoicibaDictYouDict
late 14c., "charge, onrush," from shake (v.). Meaning "a hard shock" is from 1560s. From 1580s as "act of shaking;" 1660s as "irregular vibration." The hand-grip salutation so called by 1712. As a figure of instantaneous action, it is recorded from 1816. Phrase fair shake "honest deal" is attested from 1830, American English (Bartlett calls it "A New England vulgarism"). The shakes "nervous agitation" is from 1620s. Short for milk shake from 1911. Dismissive phrase no great shakes (1816, Byron) perhaps is from dicing.
shake-down (n.)youdaoicibaDictYouDict
also shakedown, 1730, "impromptu bed made upon loose straw," from verbal phrase; see shake (v.) + down (adv.). Meaning "forced contribution" (1902) is from the verbal phrase in a slang sense "blackmail, extort" (1872). Meaning "a thorough search" is from 1914; perhaps from the notion of measuring corn. The oldest use of the verbal phrase shake down is "cause to totter and fall" (c. 1400).
shake-up (n.)youdaoicibaDictYouDict
also shakeup, "reorganization," 1899, from verbal phrase, from shake (v.) + up (adv.).
shaken (adj.)youdaoicibaDictYouDict
of persons, "weakened and agitated by shocks," 1640s, past participle adjective from shake (v.).
shakeout (n.)youdaoicibaDictYouDict
also shake-out, "business upheaval," 1895, from verbal phrase; see shake (v.) + out (adv.).
shaker (n.)youdaoicibaDictYouDict
mid-15c., "one who or which shakes," agent noun from shake (v.). Applied from 1640s (with capital initial) to various Christian sects whose devotional exercises often involved convulsions. The best-known, the American-based "Society of Believers in Christ's Second Appearing;" so called from 1784; the adjective with reference to furniture styles associated with these Shakers is recorded from 1866. Meaning "container for mixing cocktails, etc." is recorded from 1868. Phrase movers and shakers is attested from 1874.
ShakespeareyoudaoicibaDictYouDict
surname recorded from 1248; it means "a spearman." This was a common type of English surname (Shakelance (1275), Shakeshaft (1332)). Shake (v.) in the sense of "to brandish or flourish (a weapon)" is attested from late Old English
Heo scæken on heore honden speren swiðe stronge. [Laymon, "Brut," c. 1205]
Compare also shake-buckler "a swaggerer, a bully;" shake-rag "ragged fellow, tatterdemalion." "Never a name in English nomenclature so simple or so certain in origin. It is exactly what it looks -- Shakespear" [Bardsley, "Dictionary of English and Welsh Surnames," 1901]. Nevertheless, speculation flourishes. The name was variously written in contemporary records, also Shakespear, Shakespere, the last form being the one adopted by the New Shakespere Society of London and the first edition of the OED. Related: Shakespearian (1753); Shakesperean (1796); Shakesperian (1755).
shaking (n.)youdaoicibaDictYouDict
late 14c., verbal noun from shake (v.).
shako (n.)youdaoicibaDictYouDict
cylindrical soldier's hat with plume, 1815, from Hungarian csákó, short for csákós süveg "peaked cap," from adjectival form of csáko "peak, projecting point of a cow's horn," which some European etymologists derive from German zacken "point, spike," but which Hungarian sources regard as of unknown origin.
Shakti (n.)youdaoicibaDictYouDict
from Sanskrit saknoti "is able, is strong," from PIE root *kak- "to enable, help."