E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
or Sarah Gamp (g hard). A monthly nurse, famous for her bulky umbrella and perpetual reference to Mrs. Harris, a purely imaginary person, whose opinions always confirmed her own. (Dickens: Martin Chuzzlewit.)
Mrs. Harris, I says to her, if I could afford to lay out all my fellow creeturs for nothink, I would gladly do it. Such is the love I bear em.
Punch caricatures the Standard as Mrs. Sarah Gamp, a little woman with an enormous bonnet and her characteristic umbrella.
A Sarah Gamp, or Mrs. Gamp. A big, pawky umbrella, so called from Sarah Gamp. (See above.)
In France it is called un Robinson, from Robinson Crusoes umbrella. (Defoe.)