Etymology
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big bang (n.)

hypothetical explosive beginning of the universe, developed from the work of astronomers Monsignor Georges Henri Joseph Édouard Lemaître and George Gamow; the phrase is first attested 1950 (said to have been used orally in 1949), used by British astronomer Fred Hoyle (1915-2001) in an attempt to explain the idea in laymen's terms.

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big-tent (adj.)

"open to many sorts, not ideologically or theologically narrow," American English, by 1982 with reference to religion, by 1987 with reference to politics.

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Big Ben (n.)

clock-bell in the Parliament tower in London, by 1861, generally said to have been named for Sir Benjamin Hall (1802-1867), first Chief Commissioner of Works, under whose supervision the bell was cast. The name later was extended to the clock itself and its tower.

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Big Brother (n.)

"ubiquitous and repressive but apparently benevolent authority" 1949, from George Orwell's novel "Nineteen Eighty-Four." The phrase big brother for "older brother" is attested by 1833.

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Big Apple (n.)

"New York City," 1909 (but popularized by 1970s tourism promotion campaign), apparently from jazz musicians' use of apple for any city, especially a Northern one.

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Big Mac 

trademark name (McDonald's Corp.) of a type of large hamburger sandwich; by 1968.

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big shot (n.)

"important person," 1929, American English, from Prohibition-era gangster slang; earlier in the same sense was great shot (1861). Ultimately a reference to large type of gunshot; see shot (n.).

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big deal (n.)

1860s, "a good deal, a large amount;" by 1878 in financial speculation, originally in California publications; see deal (n.1). As an ironic expression, popular in American English from c. 1965, perhaps a translated Yiddishism (such as a groyser kunst).

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big-mouth (n.)

also bigmouth "person who talks too much," 1889, American English, from big + mouth (n.). Earlier as a type of fish and the name of a capable leader of the Oglala people in the 1860s.

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