burnish
verbUK /ˈbɜːnɪʃ/
US /ˈbɜːrnɪʃ/
To rub something until it becomes shiny.
He used a soft cloth to burnish the old brass doorknob until it gleamed.
OTHER MEANINGS
2. To make something seem better or more impressive than it really is.
The company tried to burnish its image after the scandal.
3. To improve or refine a skill or quality over time.
Years of practice burnished her talent for public speaking.
4. A shiny, polished surface or finish.
The table had a warm burnish that caught the light.