Etymology
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buy (n.)
"a purchase," especially a worthwhile one, 1875, American English, from buy (v.).
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buyer (n.)
c. 1200, biggere "one who purchases," agent noun from buy (v.). Meaning "one whose job is to buy goods for a store" is from 1884. Buyer's market attested from 1886.
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buy-in (n.)
"act of obtaining an interest in," 1970, from verbal phrase buy in "to purchase a commission or stock" (1826), from buy (v.) + in (adv.). To buy into "obtain an interest in by purchase" (as of stock shares) is recorded from 1680s.
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buy-out (n.)
also buy-out, "the purchasing of a controlling share in a company," 1961, from verbal phrase buy out "purchase (someone's) estate and turn him out of it," 1640s, from buy (v.) + out (adv.).
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buzkashi (n.)
Afghan sport, a sort of mounted polo played with a goat carcass, 1956, from Persian buz "goat" + kashi "dragging, drawing."
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buzz (v.)
late 15c. (buzzing is from late 14c.), echoic of bees and other insects. Aviation sense of "fly low and close" is by 1941 (see buzz (n.)). Related: Buzzed. To buzz off "go away quickly" (1914) originally meant "to ring off on the telephone," from the use of buzzers to signal a call or message on old systems. As a command, it originally would have been telling someone to get off the line.
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buzz (n.)

"a busy rumour" [Rowe], 1620s (earlier "a fancy," c. 1600), figurative use from buzz (v.). Literal sense of "a humming sound" is from 1640s. A "buzz" was the characteristic sound of an airplane in early 20c.; hence verbal sense "to fly swiftly," by 1928; by 1940 especially in military use, "to fly low over a surface as a warning signal" (for example that target practice is about to begin):

The patrol aircraft shall employ the method of warning known as "buzzing" which consists of low flight by the airplane and repeated opening and closing of the throttle. [1941 Supplement to the Code of Federal Regulations of the United States of America," Chap. II, Corps of Engineers, War Department, p. 3434, etc. ]

Meaning "pleasant sense of intoxication" first recorded 1935. The children's game of counting off with 7 or multiples of it replaced by buzz is attested from 1864 and is mentioned in "Little Women" (1868). To give (someone) a buzz (by 1922) is from the buzz that announced a call on old telephone systems (1913). Buzz bomb "V1 rocket" is from 1944.

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buzzard (n.)
c. 1300, "type of hawk not used in falconry," from Old French buisart "harrier, inferior hawk," from buson, buison, apparently from Latin buteonem (nominative buteo) a kind of hawk ("but the process of formation is not evident" - OED), perhaps with -art suffix for one that carries on some action or possesses some quality, with derogatory connotation (see -ard). In the New World extended to the American vulture (by 1830s). De Vaan says buteo is "Probably onomatopoeic, rendering the call of a hawk or buzzard."
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buzz-cut (n.)
by 1973, American English, from buzz (n.), perhaps from the sound of the barber's electric clipper, + cut (n.) in the "haircut" sense.
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buzzer (n.)
c. 1600, "buzzing insect," agent noun from buzz (v.). Used 1870s in Britain of steam-powered whistles used to call or dismiss factory workers. In reference to electricity-powered mechanical devices that buzz, from 1882.
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