Definitions from Wiktionary (squelch)

▸ 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 a threshold level for signal strength.
▸ verb:  (intransitive, British) To make a sucking, splashing noise as when walking on muddy ground.
▸ verb:  (intransitive, British) To walk or step through a substance such as mud.
▸ noun:  (countable) A squelching sound.
▸ noun:  (radio technology) The suppression of the unwanted hiss or static between received transmissions by adjusting the gain of the receiver.
▸ noun:  (countable, dated) A heavy blow or fall.
▸ noun:  (countable, music) A kind of electronic beat or sound mainly used in acid house and related music genres.

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