Definitions

1. noun

A coat of paint or varnish applied to a surface before a final coat to create a smooth base or to hide imperfections.

“The painter applied an undercoat of white to the walls before adding the final coat of color.”

2. noun

The undercoat of a mammal, especially a dog, consisting of a thick layer of soft, dense hair.

“The dog’s undercoat kept it warm in the cold winter weather.”