Sentence:  But when the moon rose and the breeze awakened, and the sedges stirred, and the cat's-paws raced across the moonlit ponds, and the far surf off Wonder Head intoned the hymn of the four winds, the trinity, earth and sky and water, became one thunderous symphony&mdash; a harmony of sound and colour <WSD>silvered</WSD> to a monochrome by the moon. 
Meaning of the word marked with <WSD> tags:  To acquire a silvery colour.