1. allow/be allowed to feel or act without constraint
give/be given free rein over a project
When you give someone ‘free rein’ you give them the freedom to behave the way that they want or to make decisions independently. This expression is especially used to talk about children having ‘free rein’ or in creative careers having ‘free rein’ over a project without restrictions. This is a phrase you will hear used in both social and professional contexts.