squelch

Concise Oxford English Dictionary © 2008 Oxford University Press:
squelch/skweltʃ/

▶verb

• 1 make a soft sucking sound, as when treading in thick mud.

• 2 informal forcefully silence or suppress.

▶noun

• 1 a squelching sound.

• 2 Electronics a circuit that suppresses the output of a radio receiver if the signal strength falls below a certain level.

– derivatives
squelcher noun,
squelchy adjective.

– origin C17: imitative.