devocalize
/ˌdɛvəˈkɑɪlaɪz/Definitions
1. verb
to deprive of a voice or a vocal quality; to render voiceless
“The politician’s powerful speech was devocalized by the protesters’ chants, making it difficult for him to be heard.”
2. noun
the act of depriving something or someone of a voice or a vocal quality
“The devocalization of the protesters’ chants led to a tense standoff between them and the police.”