Etymology
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feed (v.)
Old English fedan "nourish, give food to, sustain, foster" (transitive), from Proto-Germanic *fodjan (source also of Old Saxon fodjan, Old Frisian feda, Dutch voeden, Old High German fuotan, Old Norse foeða, Gothic fodjan "to feed"), from PIE root *pa- "to feed." Intransitive sense "take food, eat" is from late 14c. Meaning "to supply to as food" is from 1818.
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feed (n.)
"action of feeding," 1570s, from feed (v.). Meaning "food for animals" is first attested 1580s. Meaning "a sumptuous meal" is from 1808. Of machinery, "action of or system for providing raw material" from 1892.
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spoon-feed (v.)
"to feed (someone) with a spoon," 1610s, from spoon (n.) + feed (v.). Figurative sense is attested by 1864. Related: Spoon-fed.
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force-feed (v.)
by 1905 in animal husbandry, from force (n.) + feed (v.). Related: Force-fed; force-feeding. Force-feeding (n.) is from 1900.
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well-fed (adj.)
mid-14c., from well (adv.) + past participle of feed (v.).
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underfeed (v.)
1650s, from under + feed (v.). Related: Underfed; underfeeding.
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overfeed (v.)

also over-feed, "to feed to excess," c. 1600, from over- + feed (v.). Related: overfed; overfeeding.

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feeder (n.)
early 15c., "one who feeds (an animal);" 1560s, "one who eats;" agent noun from feed (v.). As a mechanical apparatus for conveying materials, from 1660s. Of cattle and streams, by 1790s; of roads and railroads, by 1850s.
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feeding (n.)

"act of taking food," Old English feding, verbal noun from feed (v.). Feeding frenzy is from 1989, metaphoric extension of a phrase that had been used of sharks since 1950s.

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feedback (n.)
1920, in the electronics sense, "the return of a fraction of an output signal to the input of an earlier stage," from verbal phrase, from feed (v.) + back (adv.). Transferred use, "information about the results of a process" is attested by 1955.
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