What does bilge mean?
Bilge is the lowest interior portion of a ship's hull, where drainage water, oil, and other residue naturally accumulate and must be removed by pumps. The word is essential in maritime contexts, giving rise to familiar equipment terms such as bilge pump and phrases like bilge water. By extension, bilge has long served as a vivid informal term for nonsense or worthless talk, much like rubbish or drivel — a figurative use that remains current, particularly in British English. The word's history reaches back through Middle English to Old Norse, sharing a Germanic root with bulge and belly, all ultimately referring to something swollen or rounded. This dual life — precise nautical term on one hand, colourful dismissive slang on the other — makes bilge a distinctive word that bridges technical seafaring vocabulary and everyday expressive language, useful both aboard ship and in conversation where blunt dismissal of foolish ideas is called for.
The lowest internal part of a ship's hull, where water collects; also, informally, nonsense or rubbish.
"Water sloshed audibly in the bilge whenever the yacht rolled."
In nautical usage the term is purely technical; in figurative use it is informal and dismissive.
(Of water) to leak into or accumulate in the bilge of a ship; to cause a ship to take in water at the bilge.
"The old trawler began to bilge badly after striking the reef."
The verbal use is chiefly nautical and relatively uncommon compared with the noun.
The plural refers to multiple compartments or sections of bilge within one or more vessels.
"Engineers inspected all the bilges before the fleet set sail."
Sailors literally pumped 'bilge' out of their ships for centuries before the word became the perfect insult for pumping nonsense out of a conversation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bilge
Bilge entered Middle English in the late medieval period, borrowed from Old Norse 'bylgja', meaning a swelling wave or billow. It shares a deeper Proto-Germanic root with the words bulge and belly, all deriving from a base meaning 'to swell'. Originally denoting the rounded, swelling lower curve of a ship's hull, its sense narrowed to the space at the very bottom of the vessel where water collects, and the figurative sense of 'nonsense' developed in English during the nineteenth century.
How bilge is actually used
The literal nautical sense is technical and neutral; the figurative sense is informal and mildly contemptuous, common in British English especially.
Easily confused with bilge
A bulge is a swelling or outward protrusion, while bilge is the bottom of a ship's hull or figurative nonsense; the two share an ancient root but have entirely different modern meanings.