c.1300, northern England dialect, "powerful, strong," of obscure origin, possibly from a Scandinavian source (cf. Norwegian dialectal bugge "great man"). Old English used micel in many of the same senses. Meaning "of great size" is late 14c.; that of "grown up" is attested from 1550s. Sense of "important" 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 1905; 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.
To e enthusiasti about or laudatory of someone or something: The boss is very big on this guy, as of now (1960s+)
Successfully; outstandingly well: The wing-dancing and funny acts catch on big (1886+)
Good; decent; admirable •Used as an epithet for an admired person: Hey, what's up, Big Charlie?