under coat

• n.
  • seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion

    同义词： undercoat underseal

  • the first or preliminary coat of paint or size applied to a surface

    同义词： flat coat ground primer priming primer coat priming coat undercoat

  • thick soft fur lying beneath the longer and coarser guard hair

    同义词： undercoat underfur

• v. cover with a primer; apply a primer to

  同义词： prime ground undercoat

以上来源于: WordNet