Meaning

noun a covered cistern; waste water and sewage flow into it

originFrom 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…

Etymology from Wiktionary, CC BY-SA 3.0