First class and Spanking-new

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

Spanking-new and first class are semantically related. in brand-new topic. In some cases you can use "Spanking-new" instead an adjective phrase "First class".

First class and spanking-new are semantically related. Sometimes you can replace phrase "First class" with "Spanking-new", this phrases are similar.