1. A sound of or as if of semiliquid matter under suction
2. The act of suppressing; especially; a retort that silences an opponent

ETYM Perh. imitative. Related to Squelch.
1. To make a sucking sound.
2. To suppress or crush completely; SYN. quell.
3. To walk through mud or mire; SYN. squish, splash, splosh, slosh, slop.