Word Study
gamp
CIDE DICTIONARY
gamp, n.
A large umbrella; -- said to allude to Mrs. Gamp's umbrella, in Dickens's “Martin Chuzzlewit.” [Webster 1913 Suppl.]
OXFORD DICTIONARY
gamp, n. Brit. colloq. an umbrella, esp. a large unwieldy one.
Etymology
Mrs Gamp in Dickens's Martin Chuzzlewit
For further exploring for "gamp" in Webster Dictionary Online