The phrase ‘Where art thou’ comes from William Shakespeare’s play ‘Romeo and Juliet.’ In modern English, it translates to ‘Where are you?’ The phrase is part of a longer line spoken by Juliet as she calls out for Romeo. In the context of the play, Juliet is expressing her longing and desire to be with Romeo, despite the obstacles they face. The phrase has since become iconic and is often used to evoke a sense of longing or searching for someone or something. Shakespeare’s use of archaic language adds a poetic and timeless quality to the expression, making it memorable even today.