messenger
noun [ C ] uk/ˈmes.ɪn.dʒər/ us/ˈmes.ɪn.dʒɚ/
送信人；通信员；信使
someone who takes a message or documents from one person to another
The documents were delivered by special messenger. 文件由特派信使送达。
a messenger boy 送信的男孩
Idiom
don't shoot the messengeridiom saying 勿斩信使（指不要迁怒于告诉你坏消息的人）
said to warn someone not to be angry with the person who tells them something bad