词典释义：
释义
n.
a close friend
密友，好朋友。
a working companion with whom close cooperation is required
同事；战友；搭档。
used as a form of address to a man whose name is not known
［用 于称呼不知道名字的人］ 兄弟；老兄
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I'm working on it, buddy. 我正在干着呢，老兄。
a person who befriends and helps another with an incapacitating disease, typically Aids
（尤指帮助艾滋病人的）义工。
v.
become friendly and spend time with
与…成为朋友，与…结交
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I decided to buddy up .to them 我决定和他们结交。
词源
"mid 19th cent．（originally US）： perhaps an alteration of
