Focus on the pronunciation of afternoon
English definition of “afternoon”
/ˌæf·tərˈnun/ n [C/U]
› the period that starts at about twelve o’clock or after the meal in the middle of the day and ends at about six o’clock or when the sun goes down: [C] She works three afternoons a week at the library. [U] My baby usually sleeps in the afternoon. [U] I spoke to her yesterday afternoon.