a plum in (one's) mouth

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a plum in (one's) mouth

A manner of speech that is indicative of a high social class. Primarily heard in UK. Because he always sounds like he has a plum in his mouth, none of us working-class sods can stand to listen to him. Have you noticed that Sally's been speaking with a plum in her mouth ever since she started living in inner London?
See also: mouth, plum

a plum in your mouth

BRITISH
If someone speaks with a plum in their mouth, they speak with an accent that is typical of a high social class. While she does not talk with a plum in her mouth, she is very articulate. Note: This expression is used to show disapproval. Note: This is from the idea that the accent used by upper-class speakers of British English makes them sound as though they have a plum in their mouth.
See also: mouth, plum
References in periodicals archive ?
The regular monthly market is celebrating its Plum Festival - including a prize of afternoon tea for two at Fir Tree Farm Cafe for the person who can recite a set text whilst holding a plum in their mouth.
Mention hunting and all they picture are toffs riding around the countryside with a plum in their mouth. A judge wouldn't convict a person without knowing all the facts.
WE OFTEN speak about having a frog in our throat or of someone who speaks with a plum in their mouth or that every time we open our mouths we put our foot in it.