both [ both ]
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Phrase
Grammar
Level
Predeterminer, determiner, & pronoun
1. Used for emphasis to refer to two people or things, regarded and identified together.
both his parents indulged him
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Adverb
1. Used before the first of two alternatives to emphasize that the statement being made applies to each (the other alternative being introduced by ‘and’)
the film has won favour with both young and old
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Usage
1. When both is used in constructions with and, the structures following ‘both’ and ‘and’ should be symmetrical. Thus, studies of zebra finches, both in the wild and in captivity is better than, for example, studies of zebra finches, both in the wild and captivity. In the second example, the symmetry of ‘in the wild’ and ‘in captivity’ has been lost. Other examples: her article is detrimental both to understanding and to peace (not her article is detrimental to both understanding and to peace)
Origin
1. Middle English from Old Norse báthir.

