verb (used with object)
to strike or press with crushing force; crush down; squash.
to put down, suppress, or silence, as with a crushing retort or argument.
verb (used without object)
to make a splashing sound.
to tread heavily in water, mud, wet shoes, etc., with such a sound.
a squelched or crushed mass of anything.
a splashing sound.
an act of squelching or suppressing, as by a crushing retort or argument.
Also called squelch circuit, noise suppressor. Electronics. a circuit in a receiver, as a radio receiver, that automatically reduces or eliminates noise when the receiver is tuned to a frequency at which virtually no carrier wave occurs.

1610–20; variant of quelch in same sense (perhaps blend of quell and quash); initial s perhaps from squash1

squelcher, noun
squelchingly, adverb
squelchingness, noun
unsquelched, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
squelch (skwɛltʃ)
1.  (intr) to walk laboriously through soft wet material or with wet shoes, making a sucking noise
2.  (intr) to make such a noise
3.  (tr) to crush completely; squash
4.  informal (tr) to silence, as by a crushing retort
5.  a squelching sound
6.  something that has been squelched
7.  electronics a circuit that cuts off the audio-frequency amplifier of a radio receiver in the absence of an input signal, in order to suppress background noise
8.  informal a crushing remark
[C17: of imitative origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1624, "to fall, drop, or stomp on something (soft) with crushing force," possibly imitative of sound made. The fig. sense of "suppress completely" is first recorded 1864.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
New designs, better mufflers, and electric options have also squelched some of
  the neighbor-alienating roar.
It is unlikely to be squelched by military means alone.
Subsequent drives were squelched wherever they came up.
If the creative team had any strong ideas, they seem to have been squelched
  sometime during the rehearsal process.
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