have a plum in one’s mouth; speak with a plum in one’s mouth

說話故作高雅；仿效上層社會的腔調說話。

例句：

• All I can remember is that he was overweight and spoke with a plum in his mouth. (我所能記得的是，他體重過胖而且說話故作高雅狀)
• Nowadays a lot of workers frequently have a plum in their mouth. (現今許多工人常常仿效上層人士的腔調說話)

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