To let a secondary or minor matter become more important than the principal one; to let the guest overshadow the host.
这家餐厅原本以提供传统菜肴闻名，但现在特色饮品却成了主打，简直是諠客夺主。
This restaurant was originally famous for its traditional dishes, but now specialty drinks have become the main attraction; it's practically a case of the guest usurping the host.
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