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English at this time was very much the ‘poor relation’ of the three in terms of prestige, and this lowly status of English post-Norman conquest finds echoes in the modern English lexicon. When people say: ‘He uttered an Anglo-Saxon expression’ as a euphemism for ‘he swore’, they do so with good reason: much of our modern earthy or taboo vocabulary carries the stigma of low-status English in medieval England, while its socially acceptable equivalents have generally been borrowed from Norman French. The social divide between the new ruling class and the subjugated English is also evident elsewhere in the lexicon. Pork, mutton and beef, delicacies available only to the Norman-speaking élites in the Middle Ages, are terms of Anglo-Norman origin, but the names of the animals which provide them, pig, sheep and cow, all come from Anglo-Saxon, the language of the farmers who produced the meat for the rulers’ table.
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David Hornsby (Linguistics: A Complete Introduction: Teach Yourself (Ty: Complete Courses Book 1))