bur·nish 
(bûrnĭsh)
(bûrnĭsh)tr.v. bur·nished, bur·nish·ing, bur·nish·es
1. To make smooth or glossy by rubbing; polish.
2. To rub with a tool that serves especially to smooth or polish.
3. To improve or make more impressive: achievements that burnished her reputation.
n.
A smooth glossy finish or appearance; luster.
[Middle English burnishen, from Old French burnir, burniss-, variant of brunir, from brun, shining, of Germanic origin; see bher-2 in the Appendix of Indo-European roots.]
burnish·er n.