1. (pron.)you the pronoun of the second person singular or plural, used of the person or persons being addressed, in the nominative or objective case: You are the highest bidder. We can't help you.
2. you one; anyone; people in general: a tiny animal you can't even see.
3. you (used in apposition with the subject of a sentence, sometimes repeated for emphasis): You rascal, you!
4. you (used in place of the pronoun your before a gerund or present participle): There's no sense in you getting upset.
5. you Archaic.
6. you yourself; yourselves.
7. (n.)you something identified with or resembling the person addressed: That bright red shirt just isn't you.
8. you the nature or character of the person addressed: Try to discover the hidden you.
Etymology: (bef. 900; ME; OE ēow (dat., acc. of gēye1), c. OFris ju, OS iu, OHG iu, eu)
1. (pronoun)you indicates the person you are talking to Do you read a lot?; You are my best friend.
2. you indicates all people or people in general You're not supposed to go in the park at night.; Witnessing murder is something you never get over.
Definition of 'you'
Webster Dictionary
1. you the pronoun of the second person, in the nominative, dative, and objective case, indicating the person or persons addressed. See the Note under Ye
Sense: (used as the subject or object of a verb, or as the object of a preposition) the person(s) etc spoken or written to You look well!; I asked you a question; Do you all understand?; Who came with you?
Definitions of you 
Afrikaans: jy, julle
Arabic: أنتَ، أنتُم، كَ، كُم: ضَم
Bulgarian: ти
Brazilian: você(s)
Czech: ty, tebe, tobě, tebou, vy
German: du, ihr, Sie, dir, euch, 
Danish: du; dig; I; jer, De; Dem
Greek: εσύ, εσείς, εσένα, εσάς
Spanish: tú, vosotros, vosotras, u
Estonian: sina, teie
Farsi: تو؛ شما
Finnish: sinä, te
French: vous; tu/toi/te
Hebrew: אַתָּה, אַתְּ, אַתֶּם, אַ
Hindi: तुम, तुमने
Croatian: ti, vi
Hungarian: te; téged; tőled; ti; tit
Indonesian: kau
Icelandic: þú, þið
Italian: tu, te, ti; voi, ve, vi; 
Japanese: あなた(たち)は
Korean: 당신(들), 자네(들), 너(희들)
Lithuanian: tu, jūs, tave, jus, tau, 
Latvian: tu; jūs; tev; jums; tevi;
Malay: awak
Dutch: jij, jullie, u
Norwegian: du/dere/De
Polish: ty, wy
Persian: تو؛ شما
Pashto: ته، تا، تاته، تاسې، تاسې 
Portuguese: você(s)
Romanian: voi; tu;ţie; îţi, ţi; pe 
Russian: вы; ты
Slovak: ty, teba, tebe, tebou, vy
Slovenian: vi, ti
Serbian: ti (vi)
Swedish: du, ni, dig, er
Thai: ท่าน; พวกท่าน; คุณ
Turkish: sen, siz, seni, sizi, san
Taiwanese: 你，你們
Ukrainian: ти, ви
Urdu: تم ، آپ
Vietnamese: bạn; anh; chị...
Chinese: 你，你们
