A receiver circuit designed to mute (squelch) the audio output when the received signal is too weak to provide acceptable audio or, in some cases, when the wrong signal is being received See also Noise Squelch, Signal Level Squelch, Tone Coded Squelch
To squelch means to make a wet, sucking sound, like the sound you make when you are walking on wet, muddy ground. He squelched across the turf
suppress or crush completely; "squelch any sign of dissent"; "quench a rebellion" walk through mud or mire; "We had to splosh across the wet meadow" make a sucking sound