Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Brit. a large umbrella, esp. one that is bulky or awkwardly wrapped
Origin: in allusion to the umbrella of Mrs. Gamp in Dickens' Martin Chuzzlewit
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun Chiefly British
A large baggy umbrella.
Origin: After the umbrella of Mrs. Sarah Gamp, a character in the novel Martin Chuzzlewit by Charles Dickens.