armband
noun uk/ˈɑːm.bænd/ us/ˈɑːrm.bænd/
[ C ]臂章;袖标
a piece of material that a person wears around the arm as a sign of something, for example an official position
All the stewards at the racetrack were wearing armbands. 所有在跑道旁的工作人员都戴着袖标。
black armbands for a funeral 参加葬礼戴的黑臂纱
[ C usually plural ] UK (US waterwings)（游泳用的）充气浮臂，救生臂环
a hollow, ring-shaped piece of plastic filled with air, that people who are learning to swim wear on their arms in water to help them float
Idiom
be wearing the armbandidiom （足球队中）戴队长袖标，当队长
to be the captain of a football team
He said wearing the armband for England was one of the "greatest achievements" of his life. 他说，带上英格兰队的队长袖标是他一生中“最伟大的成绩”。