Sandcastles crumble under the weight of the waves.
Meaning: The sandcastles that were built on the beach break apart when the waves crash against them.
Choice of Words: Sandcastles are structures built out of sand, usually by children. Crumble means to break into small pieces. Under means below or beneath something. Weight is the heaviness of an object. Waves are bodies of water that move in a regular pattern.
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