pitched battle
noun [ C ] uk/ˌpɪtʃt ˈbæt.əl/ us/ˌpɪtʃt ˈbæt̬.əl/
群殴;对阵战
a large fight, or a battle in which both sides stay in the same place
A pitched battle between the two sets of fans developed on the terraces after the match was over. 比赛结束后，双方的球迷在看台上大打出手。