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Mummerset refers to a fictional rustic English county and, more commonly, to the English dialect supposedly spoken there. Mummerset is used by actors to represent a stereotypical English West Country accent while not specifically referencing any particular county.
Mummerset draws on a mixture of characteristics of real dialects from the West Country, such as rhoticism, forward-shifted diphthongs, lengthened vowels, and the voicing of word-initial consonants that are voiceless in other English dialects. Word-initial "S" is replaced with "Z"; "F" is replaced with "V". It also uses perceived dialect grammar, replacing instances of "am", "are" and "is" with "be". The sentence "I haven't seen him, that farmer, since Friday" could be parsed in Mummerset as "Oi ain't zeen 'im that be varmer since Vroiday".
Some speakers of East Anglian English have objected to media portrayals of characters from that area speaking in "a strange kind of stage Mummerset", as in the TV adaptation of P.D. James' Adam Dalgliesh novel Devices and Desires.
Good gentleman, go your gait, and let poor volk pass. An ’chud ha’ bin
zwagger’d out of my life, ’t would not ha’bin zo long as ’tis by a vortnight. Nay, come not
near th’ old man; keep out, ’che vor ye, or Ise try whether your costard or my
ballow be the harder. ’Chill be plain with you.