group match
noun [ C ] uk/ˈɡruːp ˌmætʃ/ us/ˈɡruːp ˌmætʃ/
（足球杯赛中的）小组赛阶段的比赛
one of the games in the first part of a football cup competition when the teams are divided into groups and the teams in each group play against each other. The winner or winners of each group then move onto the next part of the competition
It's really important not to lose your first group match. 不要输掉小组赛第一场比赛很重要。