do the honours
出任重要职责，特别是在社交场合主持或执行某项任务。
口语·社交场合担任主持或执行任务
英文释义
to perform a special task or take on a special role, often as a gesture of courtesy or respect
例句
Since you're the host, why don't you do the honours and pour the wine?
典故来源
源自18世纪社交礼仪，指在正式场合担任主持或执行特殊任务，如倒酒或切蛋糕。