Meaning: This means that the waves were making a soft sound as they moved towards the shore, and it seemed like they were telling secrets to the shore.
Choice of Words: Waves are ridges of water that move across the surface of a body of water, and whispered suggests a soft, gentle sound. Secrets are things that are kept hidden or private. The sandy shore is the part of the land where sand meets the water. Together, this sentence creates a sense of mystery and intrigue, as if the waves are sharing secrets with the shore.