To demote (an IRC operator) from operator status.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "deop" in a sentence
"Thus a good many adverbs came to be indistinguishable from their ancestral adjectives, for example, hard in to pull hard, loud in to speak loud, and deep in to bury deep (= Anglo-Saxon, deop-e)."
"* Fixed a bug causing as many mode chars as target nicknames given to commands like/op,/deop etc. to be sent as part of every single resultant MODE messages sent to the server, despite one MODE message being generated for every group of three target nicknames."
"* Fixed a bug causing an empty MODE message to be sent to the server preceding the correct one when using/op,/deop and the like."