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

To make voiceless

• bluesier
• bluesiest
• blue-skies
• blue-sky
• blue-sky laws
• blue-sky thinking
• bluesman
• bluest
• bluestocking
• bluestockings
• bluestone
• bluestones
• blue streak
• blue streaks
• bluesy
• blue thistle
• blue thistles
• bluethroat
• bluethroats
• blue tit
• blue tits
• blue-tongue
• bluetongue
• bluetongues
• Bluetooth®