https://www.wordhippo.com/what-is/the-meaning-of-the-word/deop.html
What does deop mean?
To demote (an IRC operator) from operator status. Find more definitions at wordhippo.com!
deopmean
https://irssi.org/documentation/help/deop/
deop - Irssi dev help page
dev helpdeopirssi