gild the lily是究竟是锦上添花还是画蛇添足的意思啊？是不是始于莎士比亚那时啊？

gild the lily 不是很常用，具体运用如下：
v.画蛇添足

gild the lily:

vi. 作不恰当而过分的修饰(画蛇添足)

例句与用法:
1. For such a beautiful girl, to use make-up would be to gild the lily.
对一个这样漂亮的女孩来说，化妆有些画蛇添足。

2. For the beautiful girl to use makeup would be to gild the lily.
漂亮的姑娘加上化装，是锦上添花。

英英解释:
动词gild the lily:

1. adorn unnecessarily (something that is already beautiful)
同义词：paint the lily

2. make unnecessary additions to what is already complete
同义词：paint the lily