Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Jumbo, name of a very large elephant put on show in London and the U.S. in the 19th century, perhaps from mumbo-jumbo

jumbo

 adjective
     
jum‧bo [only before noun] informal
larger than other things of the same type:
jumbo-sized hot dogs
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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