top.coat HtBp7kEJt, $5tB:p7koJt n a layer of paint put onto a surface over another layer, or the type of paint used to do this 外涂层 a gallon of topcoat [U] 一加仑外涂的油漆 I usually give the doors one undercoat and two topcoats. [C] 我通常给门内涂一层，外涂两层。☆ UNDERCOAT