What does you plight thee thy troth mean?

The phrase "you/thou plight thee/thy troth" is an old-fashioned way of saying "you/thou promise to be faithful and loyal". It was often used in marriage ceremonies, where the bride and groom would pledge their love and commitment to each other. The word "plight" means to promise or give a pledge, while "troth" means faithfulness or loyalty. So, "you/thou plight thee/thy troth" means "you/thou promise to be faithful and loyal".