burnish
verb
[ ˈbəːnɪʃ ]
• polish (something, especially metal) by rubbing.
• "to burnish copper, I would probably use a drill with a pad attached to the end"
burnish
noun
• the shine on a highly polished surface.
Origin:
Middle English: from Old French burniss-, lengthened stem of burnir, variant of brunir ‘make brown’, from brun ‘brown’.