varnish
n//ˈvɑː(ɹ)nɪʃ//fernissa, lack, lacka
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.
(rail, US, informal, dated) A passenger train, probably derived from the varnished passenger cars used at one time.
(intransitive) To apply varnish.
(transitive) To cover up with varnish.