1N-COUNT 外套;轻便大衣;宽大衣 A topcoat is a coat that you wear over your other clothes. 外套;轻便大衣;宽大衣
2N-VAR (油漆等的)外涂层;外涂层漆 A topcoat is the final layer of paint or varnish that is put on something. Topcoat is the type of paint or varnish that you use for the final layer. (油漆等的)外涂层;外涂层漆