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

To make voiceless

• overissuing
• overjoy
• overjoyed
• overjoying
• overjoys
• overjump
• overjumped
• overjumping
• overjumps
• overkeen
• overkeep
• overkeeping
• overkeeps
• overkept
• overkest
• overkested
• overkesting
• overkests
• overkill
• overkills
• overkind
• overkindness
• overkindnesses
• overking
• overkings