errand
/ˈerənd; `ɛrənd/ n
1 short journey to take a message, get or deliver goods, etc 短程差使（送信、 取货或送货等）
He was tired of running errands for his sister. 他已厌烦给姐姐当跑腿了.
2 object or purpose of such a journey 差事
I've come on a special errand. 我是专程来办一件差事的.
3 (idm 习语) an errand of `mercy journey to bring help to sb who is in distress 帮助受困者之行; 雪中送炭. a fool's errand => fool1.