a plum in your mouth
US /ə plʌm ɪn jʊər maʊθ/
UK /ə plʌm ɪn jʊər maʊθ/

1.
avere una prugna in bocca, parlare con affettazione
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.
Parla con una prugna in bocca, facendolo sembrare molto aristocratico.
•
Her affected accent sounded like she had a plum in her mouth.
Il suo accento affettato sembrava che avesse una prugna in bocca.