[juhm-boh] /ˈdʒʌm boʊ/ Informal.
noun, plural jumbos.
a very large person, animal, or thing.
the jumbo box of cereal.
noun (pl) -bos
See jumbo jet
“very large, unusually large for its type,” 1882, a reference to Jumbo, name of the London Zoo’s huge elephant (acquired from France, said to have been captured as a baby in Abyssinia in 1861), sold February 1882 to U.S. circus showman P.T. Barnum amid great excitement in America and great outcry in England, both fanned by Barnum. The name is perhaps from slang jumbo “clumsy, unwieldy fellow” (1823), which itself is possibly from a word for “elephant” in a West African language (cf. Kongo nzamba).
“I tell you conscientiously that no idea of the immensity of the animal can be formed. It is a fact that he is simply beyond comparison. The largest elephants I ever saw are mere dwarfs by the side of Jumbo.” [P.T. Barnum, interview, “Philadelphia Press,” April 22, 1882]
As a product size, by 1886 (cigars). Jumbo jet attested by 1964.
Very large; gigantic; humongous: I had a jumbo portion
[1897+; fr the London Zoo’s great elephant, sold in 1882 to P T Barnum; Jumbo is a version of the word for ”elephant” in various West African languages, for example, Kongo nzamba]
/ˈdʒʌmbəʊˌaɪz/ verb 1. (transitive) to extend (a ship, esp a tanker) by cutting out the middle part and inserting a new larger part between the original bow and stern
noun 1. a widebody jet airliner. noun 1. (informal) a type of large jet-propelled airliner that carries several hundred passengers
noun a large-screen television using technology developed by Sony, typically used in sports stadiums and concert venues to show close-up shots of the event Examples They were able to watch the inauguration on JumboTrons. Word Origin 2001
[juhm-buhk] /ˈdʒʌm bʌk/ noun, Australian. 1. a sheep. /ˈdʒʌmˌbʌk/ noun 1. (Austral, archaic) an informal word for sheep