cesspool

From earlier sesspool. Origin uncertain.

Perhaps from Italian cesso (“privy, a toilet”) + English pool. Alternatively, an alteration of English dialectal suspool, from suss, soss (“a puddle; mire”) +‎ pool. Another possible derivation is from a folk etymology (influence from pool) from earlier cesperalle, alteration of Middle English suspiral, from Middle French souspirail (“an air hole”), from soupirer, souspirer (“to sigh, breathe”), from Latin suspirare.