指男子万年后必须娶妻。
宋·释普济《五灯会元》卷十六乃别有男不婚，女不嫁之谒云‘男大须婚，女长须嫁。’”
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Learn the next connected idiom: 男大当婚 (nán dà dāng hūn) → 昏迷不醒 (hūn mí bù xǐng)
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