free agent
noun [ C ] uk/ˌfriː ˈeɪ.dʒənt/ us/ˌfriː ˈeɪ.dʒənt/
（职业体育中）没有和任何队伍签约的选手
a professional sports player who does not have a contract with any particular team
行动自由的人，自由人
someone whose actions are not limited or controlled by anyone else