retouch

1. (transitive) To improve something (especially a photograph), by adding or correcting details, or by removing flaws.Examples: "For time ſhall with his ready pencil ſtand; Retouch your figures with his ripening hand; Mellow your colors, and imbrown the teint; Add every grace, which time alone can grant; To future ages ſhall your fame convey, And give more beauties than he takes away."transitive

2. (transitive) To colour the roots of hair to match hair previously coloured.transitive

3. (archaeology) To modify a flint tool by making secondary flaking along the cutting edge.