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speak with a plum in (one's) mouth
To speak in a manner that is indicative of a high social class. Primarily heard in UK. He spoke with such a plum in his mouth that none of us working-class sods could stand to listen to him.
a plum in your mouthBRITISH
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.
have a plum in your mouthhave a rich-sounding voice or affected accent. British
like a ripe plum (or ripe plums)used to convey that something can be obtained with little or no effort.
n. a prize or reward; something that can be considered the spoils of a political office. My plum for getting elected was a big new office.