An armband is a band of fabric that you wear round your upper arm in order to show that you have an official position or belong to a particular group. Some people also wear a black armband to show that a friend or relation has died.
N-COUNT
（用于學(xué)游泳的）充氣臂圈，救生臂環(huán)
Armbands are plastic rings filled with air that people who are learning to swim wear on their upper arms to help them float.
英漢詞典釋義
n.
臂帶；臂章
skipper’s armband隊(duì)長(zhǎng)袖標(biāo)Each mourner wore a black armband and a white paper chrysanthemum.每個(gè)吊唁的人都佩帶著黑紗和一朵白紙菊花。
英英詞典釋義
Noun
1. worn around arm as identification or to indicate mourning