Retuned" means adjusted or modified the tuning, often used in the context of musical instruments. When an instrument is retuned, its pitch or tone settings are changed to create a different sound. For example:
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Music: "The guitar was retuned to a lower pitch. "
Broader usage: Sometimes, "retuned" is also used metaphorically to mean adjusted or modified in any setting, like "The software was retuned to improve performance. "