Usage: UNSHUN <nick>
This command will remove a nickname from a shun list. A shun means that the person who has been shunned cannot send any messages through the server. Very often the user doesn't even notice that he/she has been shunned. See SHUN.
/unshun Fred
Shuns should generally be temporary measures unless the person is aware of being shunned. Otherwise it can be very confusing to the user.