Possible Clues:

• Gagged
• Issued a gag order on
• Shut up, declines to be set free
• Eccentric declines to be kept quiet
• Like a cellphone during a concert, one hopes
• Made noiseless
• Caused to clam up
• Subjected to a gag order
• Declines badly, being cut off
• Shut up, declines to be transferred