What does shakespeare mean by thy?

The word "thy" is an archaic second-person singular pronoun that was used in Early Modern English, the language of William Shakespeare's time. It was used to refer to the person being spoken to, and is equivalent to the modern English pronoun "your."

For example, in Shakespeare's play Romeo and Juliet, Romeo says to Juliet:

"Thy beauty doth make me see

More rich in having thee than in possessing

All the world's wealth."

In this line, Romeo is telling Juliet that her beauty makes him feel richer than if he owned all the wealth in the world. He uses the word "thy" to refer to Juliet, and it is equivalent to the modern English pronoun "your."

The use of "thy" and other archaic pronouns and verb forms is one of the things that makes Shakespeare's language so distinctive and poetic. It can be challenging for modern readers to understand, but it is also a source of the rich and complex beauty of his writing.