Burnishes

verb

1. To make smooth or shiny by rubbing; to polish; to shine.

   "In pottery, a stone is sometimes used to burnish a pot before firing, giving it a smooth, shiny look."

2. To shine forth; to brighten; to become smooth and glossy, as from swelling or filling out; hence, to grow large.
3. (metaphoric) To make appear positive and highly respected.