undercoat (plural undercoats)
- A layer of short hairs underneath the longer ones of an animal's fur
- A coat of paint or other material applied onto a surface before that of a topcoat; a coloured primer
- (obsolete) A coat for wearing indoors, under an overcoat.
layer of soft hair
coat of paint applied before a topcoat
- (transitive) To apply an undercoat to.