1540s, "not in the company of others, having no companions," from un- (1) "not" + past participle of accompany (v.). Musical sense "without instrumental accompaniment" is first recorded 1818.
实用例句
1. It is estimated that every year 50 unaccompanied children arrive in Britain.
据估计，每年有50名儿童独自来到英国。
来自柯林斯例句
2. The piece is most often sung unaccompanied.
这首歌大部分是在没有伴奏的情况下清唱的。
来自柯林斯例句
3. Unaccompanied bags are either searched or removed.
