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.
夏天的時候，孩子們被允許在後院裡無拘無束地玩耍。
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.
當我走過鬼屋時，我的想像力開始天馬行空。
translation
放縱無度, 天馬行空