Merriam-Webster's Collegiate® Dictionary, 11th Edition
SQUELCH
I. verb
Etymology: origin unknown
Date: 1624
transitive verb
1. to fall or stamp on so as to crush, b. to completely suppress ; quell , silence , to emit or move with a sucking sound, intransitive verb to emit a sucking sound, to splash through water, slush, or mire, squelcher noun
II. noun
Date: 1895
a sound of or as if of semiliquid matter under suction , the act of suppressing, squelchy adjective