Forget
From LSWiki
Command: Forget
General-Use Command Usage: forget <topic>|unnecessary|familiar|memorized
Allows you to forget the characteristics of a knowledge topic with which you are familiar or which you have memorized. If you have it memorized, it will be reduced to familiar status; if you are merely familiar with it, it will be totally forgotten.
You can also use 'forget unnecessary' to automatically forget any topics you have memorized which you do not need to have memorized because your skills or other factors would make you familiar with them regardless, 'forget familiar' to forget all your familiar topics, or 'forget memorized' to forget all your memorized topics.
Development Information: The forget command was created by Chaos; the source code was last updated Wed Feb 14 07:47:41 2007.
See Also: memorize, show familiar topics, show memorized topics, show memorization limit