a rolling stone gathers no mossCHANGE FROM ONE THING TO ANOTHERused to say that someone who often changes jobs, moves to different places etc is not able to have any permanent relationships or duties 滚石不生苔〔形容经常换工作、搬迁等的人不能有长久的关系或责任〕 → a rolling stone gathers no moss at roll1(10)