She carefully balanced the books on her head.
Meaning: She kept the books steady and in a stable position on top of her head.
Choice of Words: Balanced means to keep something steady and in a stable position. On is a preposition that indicates a position or location. Head is the top part of the body that contains the brain. So, balanced on her head means to keep something steady and in a stable position on top of her head.
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Related Expressions