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Scottish dialectal term in use since the mid-1700s, with an early appearance in 1760. From jaw (a Scots verb meaning "to pour, throw out, or splash) + hole.
Etymology from Wiktionary, CC BY-SA 4.0.
jawhole
Today it means: A hole or an open drain into which sewage or waste water is thrown; the opening of a sewer; or a cesspool or cesspit, an underground pit or container used to collect and store sewage and wastewater from a house in areas without a centralized sewer system. Full definition →