free rein
US /friː reɪn/
UK /friː reɪn/

1.
完全的自由, 自由发挥
complete freedom of action or decision
:
•
The manager gave his team free rein on the new project.
经理在新项目中给了他的团队完全的自由。
•
Artists were given free rein to express themselves.
艺术家们被赋予了充分的自由来表达自己。