Do not copy these taxonomies

By default Duplicate Post preserves all the taxonomies of the original post/page.

This option lists all the registered taxonomies (except post_format, which is handled by the Post Format option under Post/page elements to copy). Only public taxonomies are initially visible, but private taxonomies can be shown by clicking on the Show/hide private taxonomies link. Checking a taxonomy will prevent it to be copied when cloning a post/page.