Dumble

Full definition of dumble

Noun

1. (Nottinghamshire) A dale with a stream.
• 1859 John Blenkarn, British timber trees: a practical treatise on the raising, management, and value of British timber, G. Routledge, page 110:When a stream runs in a deep dell, particularly in clay districts, the steep banks and stream form what are called a “dumble” in Nottinghamshire.
• 1999 Paul A. Biggs & Sandra Biggs, Best Tea Shop Walks in Nottinghamshire, Sigma Leisure, page 106:Lambley is famous for its ‘dumbles.’ A dumble being a local name for a shallow dale with a stream. D.H. Lawrence is reputed to have enjoyed walking the Lambley Dumbles.

From dumb?

Noun

1. (slang) A stupid person.