SQUELCH

v. squash, trample, crush; suppress, silence; make wet splashing sounds (as when walking through mud)

In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. Squelch excludes undesired lower-power input signals that may be present at or near the frequency of the desired signal. Squelch is a noise gate that only allows signals at a specified strength over a threshold to be played through the speaker. As an example, general static (with no transmission) is squelched out. (Contrast with noise suppression.)
See more at Wikipedia.org...

Noun
1. a crushing remark
(synonym) put-down, squelcher, takedown
(hypernym) derision
(derivation) quell, quench
(classification) colloquialism
2. an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
(synonym) squelch circuit, squelcher
(hypernym) circuit, electrical circuit, electric circuit
Verb
1. suppress or crush completely; "squelch any sign of dissent"; "quench a rebellion"
(synonym) quell, quench
(hypernym) suppress, stamp down, inhibit, subdue, conquer, curb
(derivation) put-down, squelcher, takedown
2. make a sucking sound
(hypernym) sound, go
3. walk through mud or mire; "We had to splosh across the wet meadow"
(synonym) squish, splash, splosh, slosh, slop
(hypernym) slog, footslog, plod, trudge, pad, tramp
4. to compress with violence, out of natural shape or condition; "crush an aluminum can"; "squeeze a lemon"
(synonym) squash, crush, mash, squeeze
(hypernym) press
(hyponym) wring

(v. t.)
To quell; to crush; to silence or put down.
  

(n.)
A heavy fall, as of something flat; hence, also, a crushing reply.
  

A circuit function that acts to suppress the audio output of a receiver. [NTIA] (188 ) Note: The squelch function is activated in the absence of a sufficiently strong desired input signal, in order to exclude undesired lower-power input signals that may be present at or near the frequency of the desired signal. Contrast with noise suppression.