Syntax: DEHALFOP [#channel [nick]]
Dehalfops a selected nick on a channel. If nick is not given, it will dehalfop you. If channel and nick are not given, it will dehalfop you on all channels you're on, provided you have the rights to.
By default, limited to AOPs and those with level 5 access  and above on the channel, or to HOPs or those with level 4  and above for self dehalfopping.