The phrase 'tu es discipulus' translates to 'you are a student' in English. This phrase is important in understanding personal pronouns in Latin, where 'tu' is the second-person singular pronoun meaning 'you,' and 'es' is the present tense form of the verb 'to be,' indicating existence or identity. The word 'discipulus' means 'student,' specifically referring to a male student, showcasing how personal pronouns connect with gender in Latin.