--It is, of course, a common practice in most places to make a neighbouring ancient object a kind of standard of age. At Honiton, and in the country round, “As old as Dump’n ” used to be, and perhaps still is, a popular expression, the reference being to a British or Roman earthwork conspicuously visible on Dumpdon Hill, close by.
PROCOL.
From Notes and Queries, November 4th 1876.