Etymology
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fed (n.)
1788, short for Federalist; as colloquial for "official of the federal government," from 1916; especially, since 1930s, of FBI agents.
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fed (adj.)
past-participle adjective from feed (v.). Fed up "surfeited, disgusted, bored," is British slang first recorded 1900 (some early uses connect it to the Boer War), extended to U.S. by World War I; probably from earlier phrases like fed up to the back teeth. Earlier it was used of livestock, "fatten up by feeding." The notion probably is the same one in to have had enough "to have had too much."
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corn (v.)

1550s, "to form into grains, granulate," from corn (n.1). From 1560s as "to preserve and season with grains ('corns') of salt." From 1785 (in corned) as "make drunk," as with corn whiskey. Corned beef has nothing to do with the grain; it is so called for the "corns" or "grains" of salt with which it is preserved.

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corn (n.1)

"grain," Old English corn "single seed of a cereal plant; seeds of cereal plants generally; plants which produce corn when growing in the field," from Proto-Germanic *kurnam "small seed" (source also of Old Frisian and Old Saxon korn "grain," Middle Dutch coren, German Korn, Old Norse korn, Gothic kaurn), from PIE root *gre-no- "grain."

The sense of the Old English word was "grain with the seed still in" (as in barleycorn) rather than a particular plant. Locally understood to denote the leading crop of a district. It has been restricted to the indigenous "maize" in America (c. 1600, originally Indian corn, but the adjective was dropped), usually "wheat" in England, "oats" in Scotland and Ireland, while Korn means "rye" in parts of Germany.

Maize was introduced to China by 1550, it thrived where rice did not grow well and was a significant factor in the 18th century population boom there. Corn-starch is from 1850. Corn-silk is attested from 1852.

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corn (n.2)

"hardening or thickening of skin," early 15c., corne, from Old French corne (13c.) "horn (of an animal)," later "a corn on the foot," from Latin cornu "horn of an animal," from PIE root *ker- (1) "horn; head."

Latin cornu was used of many things similar in substance or form to the horns of animals and of projecting extremities or points: It could mean "a wart, a branch of a river, a tongue of land, the end of a bow or sail-yard, the peak of a mountain, a bugle, a wing of an army," or "the stiff hair of the Germans."

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well-fed (adj.)
mid-14c., from well (adv.) + past participle of feed (v.).
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corn-pone (n.)

"Indian-corn bread made with milk and eggs and baked in a pan," 1848, American English, from corn (n.1) + pone (n.).

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corn-stalk (n.)

also cornstalk, "stalk of a corn plant," 1816, from corn (n.1) + stalk (n.).

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seed-corn (n.)

"corn or grain set aside for seed for new crops," 1590s, from seed (n.) + corn (n.1).

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corn-row (n.)

also cornrow, 1769 as "a row of corn," by 1971 as a style of hair braids, so called for the resemblance. The verb in this sense also is by 1971.

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