They decorated it with seashells and seaweed.
Meaning: They made the sandcastle more attractive or beautiful by adding seashells and seaweed.
Choice of Words: Decorated means to make something more attractive or beautiful by adding ornaments or other objects. Seashells are the hard outer covering of some sea animals, such as clams and snails. Seaweed is a type of plant that grows in the sea.
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Related Expressions