more directive is supplied by the more plugin.
This directive provides a way to have a "more" link on a post in a blog, that leads to the full version of the page. Use it like this:
[[!more linktext="click for more" text=""" This is the rest of my post. Not intended for people catching up on their blogs at 30,000 feet. Because I like to make things difficult. """]]
linktext parameter is omitted it defaults to just "more".
pages parameter can be used to specify a
PageSpec, and then the "more" link will only be displayed
when the page is inlined into a page matching that PageSpec, and otherwise
the full content shown.
Note that you can accomplish something similar using a toggle instead.