柯林斯詞典topcoat /?t?p?k??t/ (also top coat) (topcoats) 1. N-COUNT A topcoat is a coat that you wear over your other clothes. 外套2. N-VAR 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. Compare . 外塗層漆 返回 top-coat