Used when someone changes their clothing or appearance back to what it was before. He changed back into his uniform after the costume party.
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Restoring Originals
Applies to objects or situations being returned to their original condition or setup. The room was changed back into an office from the temporary classroom.
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Non-literal Use
Sometimes used metaphorically to describe reverting to a previous behavior or state of mind. She changed back into her old cheerful self once she moved back home.