Etymology
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stare decisis (n.)

the legal doctrine of being bound by precedents, Latin, literally "to stand by things decided;" from stare "to stand" (from PIE root *sta- "to stand, make or be firm"). Second element from decidere "to decide, determine," literally "to cut off," from de- "off" (see de-) + caedere "to cut" (see -cide).

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whole cloth (n.)
early 15c., "piece of cloth of full size," as opposed to a piece cut out for a garment; figurative sense first attested 1570s.
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ditty bag (n.)

"small bag used by sailors for needles, thread, scissors, thimble, etc.," 1828, nautical slang, of uncertain origin, perhaps from the alleged British naval phrase commodity bag. Hence also ditty-box (1841).

Every true man-of-war's man knows how to cut out clothing with as much ease, and producing as correct a fit, as the best tailor. This is a necessity on board ship, for the ready-made clothing procured of the purser is never known to fit, being generally manufactured several sizes larger than necessary, in order that it may be re-cut and made in good style. [Charles Nordhoff, "The Young Man-of-War's Man," 1866]
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old-world (adj.)

1712, "belonging to a prehistoric age," see old + world. Meaning "of or pertaining to Eurasia and Africa," as opposed to the Americas, is by 1877. The noun phrase Old World in this sense is by 1590s. The division of the earth into Old World and New World among Europeans dates to 1503 and Italian explorer Amerigo Vespucci's use of Latin Mundus Novus for the lands of the western hemisphere found by Columbus and others, indicating they were not part of Asia.

The Known World is usually divided into four Parts, Europe, Asia, Africk and America. But it is a most unequal Division, and I think it more rational to divide it thus. Viz. the Known World, first into two Parts, the Old and the New World; then the Old World into three, Europe, Asia, and Africa; and the New into two, the Northern and Southern America. [Guy Miege, "A New Cosmography, or Survey of the Whole World," London, 1682]
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fait accompli (n.)
"a scheme already carried into execution," 19c., French, literally "an accomplished fact." See feat and accomplish.
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Dewey Decimal system (n.)

library classification system that organizes information into 10 broad areas subdivided numerically into progressively smaller topics, by 1885, named for Melvil Dewey (1851-1931) who proposed it 1876 while acting librarian of Amherst College. He also crusaded for simplified spelling and the metric system.

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Gordian knot (n.)
1560s, tied by Gordius (Greek Gordios), first king of Phrygia in Asia Minor and father of Midas, who predicted the one to loosen it would rule Asia. Instead, Alexander the Great cut the Gordian knot with his sword; hence the extended sense (1570s in English) "solve a difficult problem in a quick, dramatic way."
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etaoin shrdlu 
1931, journalism slang, the sequence of characters you get if you sweep your finger down the two left-hand columns of Linotype keys, which is what typesetters did when they bungled a line and had to start it over. It was a signal to cut out the sentence, but sometimes it slipped past harried compositors and ended up in print.
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in fieri 
legal Latin, "in the process of being done," from fieri "to come into being, become," used as passive of facere "to make, do" (from PIE root *dhe- "to set, put").
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Patriot Act 

signed into law Oct. 26, 2001; a contrived acronym for the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001.

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