devocalize or devocalise /dē-vōˈkə-līz/ or devoice /dē-voisˈ/

To make voiceless

• stifle bones
• stifled
• stifle-joint
• stifle-joints
• stifler
• stiflers
• stifles
• stifling
• stiflingly
• stiflings
• stigma
• Stigmaria
• stigmarian
• stigmas
• stigmata
• stigmatic
• stigmatical
• stigmatically
• stigmatics
• stigmatiferous
• stigmatisation
• stigmatisations
• stigmatise
• stigmatised
• stigmatises