a plum in your mouth

US /ə plʌm ɪn jʊər maʊθ/
UK /ə plʌm ɪn jʊər maʊθ/
"a plum in your mouth" picture
1.

tener una ciruela en la boca, hablar con afectación

an affected way of speaking, as if one has a plum in one's mouth, often associated with upper-class accents

:
He speaks with a plum in his mouth, making him sound very aristocratic.
Habla con una ciruela en la boca, lo que le hace sonar muy aristocrático.
Her affected accent sounded like she had a plum in her mouth.
Su acento afectado sonaba como si tuviera una ciruela en la boca.