1. A coat worn beneath another coat.
2. A covering of short hairs lying underneath the longer outer hairs of an animal's coat.
3. A coat of sealing material applied to a surface before the outer coats, as of paint, are applied.
4. the sealing material used for this purpose.
5. A tarlike substance sprayed on the underside of a vehicle to prevent rusting.
6. to apply an undercoat to.

1. A layer of short hairs underneath the longer ones of an animal's fur
2. A coat of paint or other material applied onto a surface before that of a topcoat; a coloured primer
3. to apply an undercoat.

1. A coat worn under another; a light coat, as distinguished from an overcoat, or a greatcoat.
2. A growth of short hair or fur partially concealed by a longer growth.

1. A coat for house-wear, or for use in mild weather, as distinguished from an overcoat.
2. in long-haired animals, the under layer of hair.

1. seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion
2. cover with a primer; apply a primer to
3. the first or preliminary coat of paint or size applied to a surface
4. thick soft fur lying beneath the longer and coarser guard hair