What does cod mean?
Cod is a large, cold-water marine fish found across the North Atlantic, long prized as one of the world's most important food fishes. Its dense, white flesh flakes cleanly when cooked, making it a staple of dishes from Britain's fish and chips to Portugal's salted bacalhau. For centuries cod fisheries drove trade, exploration, and even international disputes — the waters off New England, Newfoundland, Norway, and Iceland were contested largely because of this single species. Beyond the fish itself, 'cod' carries a distinct life in informal British English, where it can mean a hoax or practical joke, appear as a verb meaning to tease or deceive, and survive in compounds like 'codpiece' and 'codswallop'. Whether on the dinner table or in idiom, the word evokes both culinary tradition and a rich maritime history.
A large edible North Atlantic fish with firm white flesh; also, in British slang, a hoax or something fake.
"Cod has been a staple of the British diet for centuries."
The slang sense takes the indefinite article: 'the whole plan was a cod.'
(British English, informal) To tease, trick, or make fun of someone.
"Don't take him seriously — he's only codding you."
(British English, informal) Fake, mock, or deliberately imitative.
"He adopted a cod American accent for the sketch."
As a food fish, the plural is typically unchanged ('three tons of cod'); when counting individual fish or using the slang senses, 'cods' is used.
"The trawler returned with several thousand cod."
Cod was once so plentiful in the North Atlantic that explorers reported scooping them out with baskets — and its pursuit reshaped the economies and borders of entire nations.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cod
The word 'cod' first appears in Middle English, and its ultimate origin remains genuinely uncertain; lexicographers have proposed links to Old Norse and other Germanic sources without consensus. An early sense referred to a bag or pouch — hence the 'codpiece', the padded pouch worn at the front of men's hose from the fifteenth century onward. The fish name may relate to this 'bag' idea, perhaps describing the fish's shape. Derivatives such as 'codswallop' (British slang for nonsense) grew out of these later figurative uses.
Related word forms
How cod is actually used
The fish sense is standard in all registers worldwide. The slang senses ('a cod', 'to cod someone', adjective 'cod') are distinctly British and informal, largely dated today except in fixed phrases like 'cod psychology' and 'codswallop'.
Easily confused with cod
Cud is the partly digested food that cattle chew again, while cod is a North Atlantic food fish.