To add something superfluous or redundant; to make an unnecessary addition; to gild the lily.
这份设计稿已经很完美了，你再增加这些不必要的装饰，简直是眉下添眉，反而显得多余。
This design draft is already perfect; adding these unnecessary decorations would be like adding eyebrows below eyebrows, making it seem redundant instead.
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