/ ju; NAmE jə strong form juː/ pronoun
1.
used as the subject or object of a verb or after a preposition to refer to the person or people being spoken or written to :
You said you knew the way.
I thought she told you.
Can I sit next to you?
I don't think that hairstyle is you (= it doesn't suit your appearance or personality) .
2.
used with nouns and adjectives to speak to sb directly :
You girls, stop talking!
You stupid idiot!
3.
used for referring to people in general :
You learn a language better if you visit the country where it is spoken.
It's a friendly place—people come up to you in the street and start talking.
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WORD ORIGIN
Old English ēow , accusative and dative of gē (see the pronoun ye ), of West Germanic origin; related to Dutch u and German euch . During the 14th cent. you began to replace the pronoun ye , thou , and thee ; by the 17th cent. it had become the ordinary second person pronoun for any number and case.