Just curious, what does "thy" in the title mean?

Native speaker’s answer
Rebecca
Good question! "Thy" is an archaic way of saying "your." It's not used much anymore, but it can be used sometimes for well-known phrases like "know thyself." It might also be used in poetry and biblical or historical script. Ex: Thy dress is stunning. => outdated = Your dress is stunning. Ex: Thy mother and father are here. => outdated = Your mother and father are here.