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

1.
입에 자두를 문 듯한 말투, 가식적인 말투
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.
그는 입에 자두를 문 듯한 말투로 말해서 매우 귀족적으로 들린다.
•
Her affected accent sounded like she had a plum in her mouth.
그녀의 꾸민 듯한 억양은 마치 입에 자두를 문 듯했다.