exercise authority over 意味

• ～に対して権力を振るう［行使｛こうし｝する］、～を支配｛しはい｝する
  

例文

1. also , the fact that his father , michiie , and his maternal grandfather , kimitsune saionji , as kanto moshitsugi (the court official in charge of liaison with the shogunate ), began to exercise authority over the shogunate and the imperial court became a serious problem .
   また、父の道家と外祖父の西園寺公経が関東申次として幕府・朝廷の双方に権力を振るい始めた事も深刻な問題と化してきた。