the away goals rule
noun [ S ] UK uk/əˈweɪ ˌɡəʊlz ˌruːl/ us/əˈweɪ ˌɡoʊlz ˌruːl/
（足球的）客场进球规则
in football, a way of deciding the result of a cup competition played over two games when the final score is level, in which goals scored by the team playing away from home are worth double