undercoat

• 该名词有多个义项：涂在汽车底盘上以防止生锈的保护涂层；涂在表面上的底漆，即在主涂层之前涂的初步涂层；或动物较长针毛下浓密柔软的绒毛层。

A noun with multiple meanings: a protective coating applied to the underside of a vehicle to prevent rust; a preliminary layer of paint applied to a surface before the main coat; or the dense, soft layer of fur beneath an animal's longer guard hairs.

1. Vehicle protective coatingB2formaltechnical

   A layer of tar or rubber-like material applied to the underside of a motor vehicle to prevent rust and corrosion.

   防锈涂层

   • The mechanic recommended applying an undercoat to protect the car from winter salt.
   • The truck's undercoat had worn away after years of driving on gravel roads.
   • A fresh undercoat can significantly extend the life of a vehicle's chassis.

   同义词underseal

2. Base paint layerB1formaltechnical

   The first layer of paint or primer applied to a surface before the final coat.

   底漆

   • You need to apply an undercoat before painting the walls for a smooth finish.
   • The painter used a white undercoat to make the blue topcoat more vibrant.
   • Sanding the undercoat helps the final paint adhere better.

   同义词groundprimer

   反义词finishovercoattopcoat

3. Animal fur layerB2formalscientific

   The dense, soft layer of fur beneath the longer and coarser guard hairs of an animal, providing insulation.

   底绒

   • The dog's thick undercoat keeps it warm during the winter months.
   • Siberian huskies have a dense undercoat that sheds heavily in spring.
   • Brushing the undercoat helps reduce shedding and keeps the animal comfortable.

   同义词downunderfur

• 动词，指在涂面漆或最终涂层之前先涂上一层底漆或底料作为基础涂层。

A verb meaning to apply a preparatory layer of paint or coating beneath the final finish.

1. Apply a primerB2formal

   To cover a surface with a preparatory layer of paint or sealant before applying the final coat.

   涂底漆

   • Before painting the wall, you should undercoat it to ensure better adhesion.
   • The carpenter undercoated the wooden frame to protect it from moisture.
   • Make sure to undercoat the metal surface to prevent rust.

   同义词groundprimesealsize