Etymology
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big (adj.)

c. 1300, at first found chiefly in northern England and north Midlands writing, "powerful, strong," of obscure origin, possibly from a Scandinavian source (compare Norwegian dialectal bugge "great man"). Old English used micel (see much) in many of the same senses. It came into general use c. 1400. Meaning "of great size" is late 14c.; that of "full-grown, grown up" is attested from late 14c. Sense of "important, influential, powerful" is from c. 1400. Meaning "haughty, inflated with pride" is from 1570s. Meaning "generous" is U.S. colloquial by 1913.

Big band as a musical style is from 1926. Slang big head "conceit" is first recorded 1850. Big business "large commercial firms collectively" is from 1913 (before that it meant "a profitable income in business"). Big top "main tent of a circus" is from 1895. Big game "large animals hunted for sport" is from 1864. Big house "penitentiary" is U.S. underworld slang first attested 1915 (in London, "a workhouse," 1851). In financial journalism, big ticket items so called from 1956. Big lie is from Hitler's grosse Lüge.

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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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biggie (n.)
1931, "important person," from big + -ie.
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bigly (adv.)
early 14c., "strongly, vehemently," from big + -ly (2). From 1530s as "haughtily, arrogantly."
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bigfoot (n.)
supposed elusive man-like creature of the Pacific Northwest, 1963, from big (adj.) + foot (n.).
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bighorn (n.)
"Rocky Mountain sheep," 1805, American English, from big + horn (n.).
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bigass (adj.)
also big-ass, big-assed, by 1945, U.S. military slang, from big + ass (2).
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