errand
/ˈerənd/noun
1- a short journey undertaken in order to deliver or collect something, especially on someone else's behalf（短程的）差事; 差使：
she asked Tim to run an errand for her.
她叫蒂姆去为她办点儿事。
1.1
- archaic the purpose or object of such a journey〈古〉使命; 任务：
she knew that if she stated her errand she would not be able to see him.
她知道, 如果她说出自己的使命就再也看不到他了。
短语
errand of mercy
- a journey or mission carried out to help someone in difficulty or danger援助使命; 救援行动。
词源
Old English ǣrende 'message, mission', of Germanic origin; related to Old High German ārunti, and obscurely to Swedish ärende and Danish aerinde.