British slang for nonsense, rubbish, or a ridiculous statement; something that is obviously false or worthless.
Of disputed origin; possibly from Cods (a surname, perhaps referring to a person) + wallop (a blow or hit). The true origin is debated by etymologists.
Even though everyone uses 'codswallop,' nobody really knows where it comes from—it's a delightful example of how slang can be completely successful while its origin remains a mystery.
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