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SWAK [SWAK 词源字典]: acronym for sealed with a kiss, attested from 1911, in a legal publication quoting a letter from 1909:
"... Well Kid I don't know nothing else to say only that I hope to see your sweet face Sat. Good by from your Dear Husban to his sweet little wife. P. S. excuse bad writing and mispelled words take all mistakes as kisses. S.W.A.K. * * *" This letter was postmarked at Des Moines October 20, 1909, addressed to Carrie Sprague at Jefferson, Iowa, and reached the latter place October 21, 1909. [State v. Manning (a conspiracy-to-lure-women-to-prostitution case), Supreme Court of Iowa, Nov. 16, 1910, reported in "Northwestern Reporter," Volume 128, 1911]
Popularized in soldiers' letters home in World War I. It probably is meant also to echo the sound of a kiss. Compare Middle English swack "a hard blow" (late 14c.).[SWAK etymology, SWAK origin, 英语词源]
swale (n.): "low, hollow place, often boggy," 1580s, special use of Scottish swaill "low, hollow place," or East Anglian dialectal swale "shady place" (mid-15c.); both probably from Old Norse svalr "cool," from Proto-Germanic *swalaz. A local word in England, in U.S. given broad application, especially to the lower tracts of the prairie and recently to landscaping features in suburban developments.
swallow (v.): "ingest through the throat" (transitive), Old English swelgan "swallow, imbibe, absorb" (class III strong verb; past tense swealg, past participle swolgen), from Proto-Germanic *swelgan/*swelhan (cognates: Old Saxon farswelgan, Old Norse svelgja "to swallow," Middle Dutch swelghen, Dutch zwelgen "to gulp, swallow," Old High German swelahan "to swallow," German schwelgen "to revel"), probably from PIE root *swel- (1) "to eat, drink" (cognates: Iranian *khvara- "eating").

Intransitive sense "perform the act of swallowing" is from c. 1700. Sense of "consume, destroy" is attested from mid-14c. Meaning "to accept without question" is from 1590s. Related: Swallowed; swallowing.
swallow (n.1): type of migratory bird (family Hirundinidae), Old English swealwe "swallow," from Proto-Germanic *swalwon (cognates: Old Saxon, Old Norse, Old Frisian, Swedish svala, Danish svale, Middle Dutch zwalewe, Dutch zwaluw, Old High German swalawa, German Schwalbe), from PIE *swol-wi- (cognates: Russian solowej, Slovak slavik, Polish słowik "nightingale"). The etymological sense is disputed. Popularly regarded as harbingers of summer; swallows building nests on or near a house is considered good luck.
swallow (n.2): "an act of swallowing," 1822, from swallow (v.). In late Old English and Middle English it meant "gulf, abyss, hole in the earth, whirlpool," also, in Middle English, "throat, gullet." Compare Old Norse svelgr "whirlpool," literally "devourer, swallower." Meaning "as much as one can swallow at once, mouthful" is from 1861.
swallowtail (n.): also swallow-tail, 1540s as a type of arrowhead, from swallow (n.1) + tail (n.). Of a type of butterfly, by 1776; of a type of coat, 1835. As an adjective from 1590s. The bird's tail is long and deeply forked.
swam: past tense of swim (v.).
swami (n.): 1773, "Hindu idol," later, "Hindu religious teacher" (1901), from Hindi swami "master" (used as a term of address to a Brahmin), from Sanskrit svamin "lord, prince, master, (one's own) master," from sva-s "one's own" (from PIE *s(u)w-o- "one's own," from root *s(w)e-; see idiom) + amah "pressure, vehemence."
swamp (v.): "overwhelm, sink (as if in a swamp)," 1772, from swamp (n.). Figurative sense is from 1818. Related: Swamped; swamping.
swamp (n.): c. 1500 (implied in swampwatyr "swamp-water"), of uncertain origin, perhaps [Barnhart] a dialectal survival from an Old English cognate of Old Norse svöppr "sponge, fungus," from Proto-Germanic *swampuz; but traditionally connected with Middle English sompe "morass, swamp," which probably is from Middle Dutch somp or Middle Low German sump "swamp" (see sump). All of these likely are ultimately related to each other, from PIE *swombho- "spongy; mushroom," via the notion of "spongy ground."
[B]y swamps then in general is to be understood any low grounds subject to inundations, distinguished from marshes, in having a large growth of timber, and much underwood, canes, reeds, wythes, vines, briers, and such like, so matted together, that they are in a great measure impenetrable to man or beast .... [Bernard Romans, "A Concise History of East and West Florida," 1775]
More popular in U.S. (swamp (n.) by itself is first attested 1624 in Capt. John Smith's description of Virginia). Swamp-oak is from 1680s, American English. Swamp Yankee "rural, rustic New Englander" is attested from 1941. Thornton's "American Glossary" (1912) has swamp-angel "dweller in a swamp," swamp-law "might makes right."
swamp-land (n.): 1660s, from swamp (n.) + land (n.).
swamper (n.): 1735, "one who lives in a swampy district," from swamp (n.). Meaning "workman who clears a lumber road through swamp or forest" is 1857, American English; meaning "all-purpose assistant in a restaurant or saloon" is from 1907.
swampy (adj.): 1690s, from swamp (n.) + -y (2). Related: Swampiness.
swan (n.): Old English swan "swan," from Proto-Germanic *swanaz "singer" (cognates: Old Saxon swan, Old Norse svanr, Danish svane, Swedish svan, Middle Dutch swane, Dutch zwaan, Old High German swan, German Schwan), probably literally "the singing bird," from PIE root *swen- "to sing, make sound" (see sound (n.1)); thus related to Old English geswin "melody, song" and swinsian "to make melody."

In classical mythology, sacred to Apollo and to Venus. The singing of swans before death was alluded to by Chaucer (late 14c.), but swan-song (1831) is a translation of German Schwanengesang. The ancient Indo-European mythical swan-maiden so called by mythographers from 1829. Swan dive is recorded from 1898. A black swan was proverbial for "something extremely rare or non-existent" (late 14c.), after Juvenal ["Sat." vi. 164], but later they turned up in Australia (Chenopsis atratus).
"Do you say no worthy wife is to be found among all these crowds?" Well, let her be handsome, charming, rich and fertile; let her have ancient ancestors ranged about her halls; let her be more chaste than all the dishevelled Sabine maidens who stopped the war--a prodigy as rare upon the earth as a black swan! yet who could endure a wife that possessed all perfections? I would rather have a Venusian wench for my wife than you, O Cornelia, mother of the Gracchi, if, with all your virtues, you bring me a haughty brow, and reckon up Triumphs as part of your marriage portion. [Juvenal]
Swanee: in Stephen Foster's "Old Folks at Home," river in Georgia and Florida, usually Suwanee, sometimes said to be a corruption of Spanish San Juan [Room]; Bright says the river name is from the Cherokee village of Sawani, for which no etymology is offered.
swang: obsolete past tense of swing (v.).
swank (adj.): "stylish, classy, posh," 1913, from earlier noun or verb; "A midland and s.w. dial. word taken into general slang use at the beginning of the 20th cent." [OED]; compare swank (n.) "ostentatious behavior," noted in 1854 as a Northampton word; swank (v.), from 1809 as "to strut, behave ostentatiously." Perhaps ultimately from Proto-Germanic *swank-, from PIE *sweng(w)-, a Germanic root meaning "to swing, turn, toss" (cognates: Middle High German swanken "to sway, totter, turn, swing," Old High German swingan "to swing;" see swing (v.)). Perhaps the notion is of "swinging" the body ostentatiously (compare swagger).

A separate word-thread derives from Old English swancor "pliant, bending," and from this comes swanky (n.) "active or clever young fellow" (c. 1500).
swanky (adj.): "imposing, stylish," 1842, from swank + -y (2). Related: swankiness.
Swansea: a Scandinavian name, probably literally "Sveinn's Island."
swap (v.): c. 1200, "to strike, strike the hands together," of uncertain origin, possibly imitative of the sound of hitting or slapping. The sense of "to exchange, barter, trade" is first recorded 1590s, possibly from the notion of slapping hands together as a sign of agreement in bargaining (as in strike a bargain). Related: Swapped; swapping. The noun in this sense is attested from 1620s; earlier "a striking, an act of striking" (mid-13c.). Swap-meet attested from 1968, American English.