Asisat Oshoala scored after a mix-up between Australia's Alanna Kennedy and Mackenzie Arnold

A mix-up is when someone (or in this case more than one person) makes a mistake but probably that this mistake was easily avoidable. Maybe there is a mix-up in communication which is where one person doesn't fully understand another person and this is what happened in the Australian defence when the defender Kennedy and the keeper Arnold both went for the same ball - they didn't communicate clearly and this allowed the Nigerian player Oshoala to score. Because of this mix-up they conceded a goal.