1used to refer to the person or people that the speaker is addressing:are you listening?I love you
used to refer to the person being addressed together with other people regarded in the same class:you Australians
used in exclamations to address one or more people:you foolshey, you!
2used to refer to any person in general:after a while, you get used to it
you and yours
you together with your family and close friends.
you-know-who (or you-know-what)
used to refer to someone (or something) known to the hearer without specifying their identity:the minister was later to be sacked by you-know-who
Old Englishēow, accusative and dative of gē(see ye1); related to Dutch u and German euch. During the 14th century you began to replace ye1, thou1, and thee; by the 17th century it had become the ordinary second person pronoun for any number and case