Definitions for "Razee"
An armed ship having her upper deck cut away, and thus reduced to the next inferior rate, as a seventy-four cut down to a frigate.
To cut down to a less number of decks, and thus to an inferior rate or class, as a ship; hence, to prune or abridge by cutting off or retrenching parts; as, to razee a book, or an article.
a ship of the line with a deck removed, seems a lot of effort to go to to produce an even more underpowered ship, but I guess you had some kind of speed benefit