varnish

Short definition from Wiktionary

Noun

1. 1
   A clear or translucent liquid coating composed of resin dissolved in a solvent, which dries by evaporation to form a hard, protective, and typically glossy finish.
2. 2
   Anything resembling such a coating; a glossy appearance.
3. 3
   A deceptively showy appearance.
4. 4
   A passenger train, probably derived from the varnished passenger cars used at one time.

Verb

1. 1
   To apply varnish.
2. 2
   To cover up with varnish.
3. 3
   To make something superficially or deceptively attractive
4. 4
   To gloss over a defect.