(music 音乐) if singers or musicians sing or play in unison, they sing or play notes at the same pitch or at one or more octaves apart （歌唱或演奏）齐声，同音，同度
同时；一起；If two or more people do something in unison, they do it together at the same time. [PHR after v]
The students gave him a rapturous welcome, chanting in unison: ‘We want the king!‘…
学生们给予了他热烈的欢迎，他们齐声高喊：“我们要国王！”
Michael and the landlady nodded in unison.
迈克尔和房东太太一起点头。