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dun [dun 词源字典]: dun: English has two words dun. The colour adjective, ‘greyish brown’ [OE], comes ultimately from Indo-European *donnos, *dusnos, which is also the source of English dusk. The now rather dated noun, ‘debtcollector’ [17], is an abbreviation of dunkirk, a 17th-century term for a ‘privateer’, a privately owned vessel officially allowed to attack enemy shipping during wartime.

It was originally applied from such privateers that sailed from the port of Dunkirk, on the northern coast of France, to attack British ships, and its connotations of unwarranted piracy soon spread metaphorically to one who was constantly importuning for the repayment of his loan.
=> donkey, dusk, obfuscate[dun etymology, dun origin, 英语词源]
Alsace: region between France and Germany (disputed by them 18c.-19c.), Medieval Latin Alsatia, from Old High German *Ali-sazzo "inhabitant of the other (bank of the Rhine)," from Proto-Germanic *alja "other" + Old High German -sazzo "inhabitant," literally "one who sits." Alsatian was adopted 1917 by the Kennel Club for "German Shepherd dog" to avoid the wartime associations of German; the breed has no connection with Alsace.
austerity (n.): mid-14c., "sternness, harshness," from Old French austerite "harshness, cruelty" (14c.) and directly from Late Latin austeritatem (nominative austeritas), from austerus (see austere). Of severe self-discipline, from 1580s; hence "severe simplicity" (1875); applied during World War II to national policies limiting non-essentials as a wartime economy.
catchpoll (n.): Old English *kæcepol "tax-gatherer," from Old North French cachepol (Old French chacepol), from Medieval Latin cacepollus "a tax gatherer," literally "chase-chicken." For first element see chase (v.), for second see pullet. In lieu of taxes they would confiscate poultry. Later in English more specifically as "a sheriff's officer whose duty was to make arrests for debt." Compare Old French chacipolerie "tax paid to a nobleman by his subjects allowing them and their families to shelter in his castle in wartime."
chicken hawk (n.): type of hawk that is believed to prey on domestic fowl, 1802, American English. Figuratively, from the secondary senses of both words, "public person who advocates war but who declined significant opportunity to serve in uniform during wartime," at least 1988, American English. From chicken (n.) + hawk (n.).
convoy (n.): early 16c., "the act of guiding or escorting for protection," from convoy (v.), late 14c., from Old French convoier, from Vulgar Latin *conviare, literally "go together on the road" (see convey). The meaning "train of ships or wagons carrying munitions or provisions in wartime under protection of escort" is from c. 1600.
dun (v.): "to insist on payment of debt," 1620s, perhaps related to dunnen "to sound, resound, make a din" (c. 1200, dialectal variant of din), or shortened from dunkirk (c. 1600) "privateer," a private vessel licensed to attack enemy ships during wartime, from Dunkirk, French port from which they sailed. The oldest theory traces it to a Joe Dun, supposedly a London bailiff famous for catching defaulters. Related: Dunned; dunning. As a noun from 1620s.
Hooverville: 1933, American English, from U.S. president Herbert C. Hoover (1874-1964), who was in office when the Depression began, + common place-name ending -ville. Earlier his name was the basis of Hooverize "economize on food" (1917) from his role as wartime head of the U.S. Food Administration.
rationing (n.): "restriction to limited allotments," 1865, verbal noun from ration (v.). Specifically of restrictions during wartime from 1917, from conditions in England during World War I.
Smokey Bear (n.): "state policeman," 1974, from truckers' slang, in reference to the wide-brim style of hat worn by state troopers (the hats so called by 1969). Ultimately the reference is to a popular illustrated character of that name, dressed in forest ranger gear (including a hat like those later worn by state troopers). He was introduced in 1944 by the U.S. Forest Service and the Wartime Advertising Council in a campaign to lower the number of forest fires in the West.