Wiktionary
devoice
vb. 1 (context transitive phonetics English) To pronounce a word with little movement of the vocal cords 2 (context transitive Internet English) To remove the voice flag from a user on IRC, preventing them from sending messages to the channel.
WordNet
devoice
v. utter with tense vocal chords [ant: voice]
Usage examples of "devoice".
The workroom where Janet and Dorothea's foster sister Ellen Gunn supervised the operation of the airfarm was deserted at this time of the evening, its cluttered desks abandoned, the computer displays and sophisticated business machines devoiced but still blinking as they ruminated electronically over cuds of data.
To feel sorry for him was to demean him, and any demeaning thought was routed to the devoicing circuit.