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both - definition and synonyms

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90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

determiner, predeterminer, pronoun     both pronunciation in British English
Both can be used in the following ways:
as a determiner (followed by a noun, but not by a pronoun): Both children are at school.
as a predeterminer (followed by a word such as ‘the’, ‘this’, ‘his’ etc): I like both these pictures.Both her children are boys.
as a pronoun: Both arrived at the same time. (followed by ‘of’): Both of them are learning English. (after a noun or pronoun subject): The twins both have black hair. (following a pronoun object): I like them both. (after a modal or auxiliary verb, or after the verb ‘to be’): We can both speak Spanish.They are both good singers.
in the expression both...and...: a method that is both simple and effective
  1. used for showing that you are referring to two people or things, and that you are saying the same thing about the two of them

    Both my parents are doctors.

    You can write on both sides of the paper.

    There were two separate projects, and both came up with the same results.

    She invited us both down for a drink.

    both of:

    Both of the leaders expressed hope that the talks would continue.

    two companies, both of which are owned by News International



to manipulate someone psychologically so that they begin to question their own perceptions and memories

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Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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