at a loose end
无所事事，没有目标或计划
口语·形容空闲无聊的状态
英文释义
to have nothing to do or be unsure of what to do
例句
After finishing all his work early, he was at a loose end and didn't know what to do.
典故来源
源自航海术语，指船缆未系紧而松散，比喻人没有明确任务或目标。