Definitions of squelch:

• noun:   an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
• noun:   a crushing remark
• verb:   make a sucking sound
• verb:   suppress or crush completely

  Example: "Squelch any sign of dissent"

• verb:   walk through mud or mire
• verb:   to compress with violence, out of natural shape or condition