Etymology
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potato (n.)

1560s, "sweet potato," from Spanish patata, from a Carib language of Haiti batata "sweet potato." Sweet potatoes were first to be introduced to Europe; they were in cultivation in Spain by mid-16c. and in Virginia by 1648. Early 16c. Portuguese traders carried the crop to all their shipping ports and the sweet potato was quickly adopted from Africa to India and Java.

"This was the original application of the name, and it is in this sense that the word is generally to be understood when used by English writers down to the middle of the seventeenth century" [Century Dictionary].

The name later (1590s) was extended (based on general likeness, both being esculent tubers) to the common white potato, native to Peru, which was at first (mistakenly) called Virginia potato, or, because at first it was of minor importance compared to the sweet potato, bastard potato. Spanish invaders in Peru began to use white potatoes as cheap food for sailors 1530s.

The first potato from South America reached Pope Paul III in 1540; it was grown in France at first as an ornamental plant. According to popular tradition, it was introduced to Ireland 1565 by John Hawkins. It was brought to England from Colombia by Sir Thomas Herriot, 1586.

German Kartoffel (17c.) is a dissimilation from tartoffel, ultimately from Italian tartufolo (Vulgar Latin *territuberem), originally "truffle." Frederick II forced its cultivation on Prussian peasants in 1743. The French is pomme de terre, literally "earth-apple;" a Swedish dialectal word for "potato" is jordpäron, literally "earth-pear."

Colloquial pronunciation tater is attested in print from 1759. Potato salad is by 1842 as a typical German dish; by 1844 in English cookery books. For Potato chip see chip (n.1); for the British alternative potato crisp see crisp (adj.). Slang potato trap "mouth" is attested from 1785. The Potato Famine in Ireland from 1845 to 1849 was so called by 1851, mostly outside Ireland; in it it is typically the Great Famine, Great Hunger, or Great Starvation.

To drop (something) like a hot potato is from 1824. Children's counting-out rhyme that begins one potato, two potato is recorded by 1885 in Canada.

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breeches (n.)

"bifurcated garment worn by men, covering the body and waist to the knees," c. 1200, a double plural (also breechen, and singular breech), from Old English brec "breeches," plural of broc "garment for the legs and trunk," from Proto-Germanic *brokiz (source also of Old Norse brok, Dutch broek, Danish brog, Old High German bruoh, German Bruch, obsolete since 18c. except in Swiss dialect), perhaps from PIE root *bhreg- "to break." The etymological notion would be of a garment "forked" or "split." The singular breech survived into 17c., but the word is now always used in the plural.

The Proto-Germanic word is a parallel form to Celtic *bracca, source (via Gaulish) of Latin braca (source of French braies, Italian braca, Spanish braga). Some propose that the Germanic word group is borrowed from Gallo-Latin, others that the Celtic was from Germanic, but OED writes that the Proto-Germanic noun "has all the markings of an original Teutonic word."

Classical bracae were part of the characteristic garb of Gauls and Orientals; they were not worn by Greeks or Romans until the end of the republic. After 1c. they came into use at first among military forces stationed in cold climates and were adopted generally toward the end of the empire, though they never seem to have been much in favor in Rome proper.

The expanded sense of "lower part of the body, part of the body covered by breeches, posterior" led to senses in childbirthing (1670s) and gunnery ("the part of a firearm behind the bore," 1570s). As the popular word for "trousers" in English, it was displaced in U.S. c. 1840 by pants. The Breeches Bible (Geneva Bible of 1560) is so called on account of rendition of Genesis iii.7 (already in Wyclif) "They sewed figge leaues together, and made themselues breeches."

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