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touch something up
to fix up the minor flaws in something; to repair a paint job on something. It's only a little scratch in the finish. We can touch it up easily. Tom touched up the scrape with a little paint.
Make minor changes or improvements, as in This wall needs some touching up but not complete repainting. [Early 1700s]
To improve something by making minor corrections, changes, or additions: I touched up the nicks in the paint to prevent the metal from rusting. The author touched an old essay up and submitted it for publication.