noun
Refers to a coat of paint or primer applied before the topcoat, or a garment worn under a coat. Common in painting, automotive, and fashion contexts.
車の塗装にはアンダーコートが欠かせない。
An undercoat is essential when painting a car.
寒い日はアンダーコートを着ると暖かい。
On cold days, wearing an undercoat keeps you warm.