squelch

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To subdue forcibly.
• intransitive verb To inhibit or suppress.
• intransitive verb Archaic To crush by trampling.
• intransitive verb To produce a splashing, squishing, or sucking sound, as when walking through ooze.
• noun A squishing sound.
• noun An electric circuit that cuts off a radio receiver when the signal is too weak for reception of anything but noise.

from The Century Dictionary.

• noun A crushing blow; a heavy fall.
• To make a sound like that produced by treading in mud.
• To crush down; stamp on as if squeezing out something liquid; put an end to.
• To disconcert; discomfit; put down.
• To be crushed.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb colloq. To quell; to crush; to silence or put down.
• intransitive verb To make a sound like that made by the feet of one walking in mud or slush; to make a kind of swashing sound; to squish; also, to move with such a sound.
• noun A heavy fall, as of something flat.
• noun colloq. A crushing reply.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive, US to halt, stop, eliminate, stamp out, or put down, often suddenly or by force
• verb transitive, radio technology to suppress the unwanted hiss or static between received transmissions by adjusting the gain of your receiver.
• verb intransitive, UK to make a sucking, splashing noise as when walking on muddy ground
• verb intransitive, UK to walk or step through a substance such as mud
• noun A squelching sound.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb to compress with violence, out of natural shape or condition
• noun a crushing remark
• verb make a sucking sound
• verb suppress or crush completely
• verb walk through mud or mire
• noun an electric circuit that cuts off a receiver when the signal becomes weaker than the noise