To add unnecessary ornamentation to something already beautiful, thereby spoiling its simplicity or causing it to be overdone.

पहले से सुंदर वस्तु को अनावश्यक सजावट से सजाना

English Usage: She decided to gild the lily by adding more decorations to the already beautiful cake.

Hindi Usage: उसने पहले से ही सुन्दर केक पर और सजावट करके अनावश्यक सजावट की।