Verb
make unnecessary additions to what is already complete
adorn unnecessarily (something that is already beautiful)
Source: WordNetMy favorite way to cook trout is whole, bone-in, on the grill. The fish are stuffed with sliced lemons and herb sprigs, brushed with oil, and cooked over fairly hot coals until the skin is crisp and the flesh is moist and flaky. Go ahead and gild the lily by adding a sauce. Tom Douglas
If you can figure out where you fit into any particular story, you'll be okay. When you're not quite sure where you fit in, you try to be too many parts of the story. You gild the lily. I see it all the time. John C. McGinley