Flags wave high.
Meaning: This means the flags on the sandcastle are high up and moving in the wind.
Choice of Words: Flags are pieces of fabric that are used as symbols or for signaling. Wave means to move back and forth in a regular motion. High means to a great extent or distance. When you put them together, "Flags wave high" describes the flags on a sandcastle as being high up and moving in the wind.
Alternative Expressions
Related Expressions