Gilding is a thin covering of gold laid over a surface. Restore the gilding, the gilding has worn, gold leaf gilding.
The leaf used is beaten thinner than a thousandth of a millimetre, so a very little gold covers a great deal. Gilding the lily is the fixed phrase for improving something already fine, and it misquotes Shakespeare.
1noungildingA thin covering of gold laid over a surface.
“The gilding on the church dome shone in the evening sun.”
gilding is a covering.