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The extra maintenance cost created when the same code or copy is repeated everywhere.
Copy-Paste Tax shows up when one wording, style, or bug has to be fixed in ten places because it was duplicated instead of shared.
Plainly
If you write the same note ten times, you must fix it ten times.
In practice
Move repeated UI, labels, or logic into a component, data file, or helper when repetition starts slowing changes.