The word "be gilding" refers to the act of adding a layer of gold or gold color to something. Antonyms for this word would be stripping or removing gold, so un-gilding, de-gilding, or stripping would be appropriate. Other antonyms for "be gilding" could be tarnishing or rusting, as these actions would cause the surface to become more dull and lose its shine. Alternatively, another antonym could be naturalizing, as this refers to allowing something to exist in its natural, unadorned state. Overall, there are several ways to express the opposite of "be gilding," depending on the context and intended meaning.