phrase
C2
When someone, especially a child, behaves without any control or rules.
During the summer, the kids are allowed to run wild in the backyard.
夏の間、子供たちは裏庭で自由に遊ぶことが許されています。
C2
When someone's thoughts or imagination are not controlled and become very active.
As I walked through the haunted house, my imagination began to run wild.
お化け屋敷を歩いていると、私の想像力が暴走し始めました。
translation
自由に振る舞う, 想像が広がる