unison

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++u·ni·son /ˈjuːnəsən, -zən/ noun  in unison a) TOGETHERif people speak or do something in unison, they say the same words at the same time or do the same thing at the same time 〔说话、做事〕一起，一齐 ‘Good morning!’ the kids replied in unison. “早上好！”孩子们齐声应答。 b) PGTOGETHERif two groups, governments etc do something in unison, they do it together because they agree with each other 共同，一致〔做某事〕 Management and workers must act in unison to compete with foreign business. 管理层和员工必须联合起来与外国企业竞争。

Examples from the Corpus

unison• The office fellows on the table behind laughed abruptly and in unison.• All consider that good and evil can not be in unison.• They deserve to be listed in this context, as they often operate in unison even if they do not always do so.• While her class was reciting in unison you could not hear very much in mine.• It only needed two men working in unison to raise and lower the junk sails to suit the wind strength.• Stephen Legate looked out of phase in the unison tableaux.Origin unison (1500-1600) Old French Medieval Latin unisonus “having the same sound”, from Latin uni- + sonus “sound”

u·ni·son nounChineseSyllable  

if unison, something speak in or do Corpus people

unison
u‧ni‧son /ˈjuːnəsən, ˈjuːnɪsən, -zən/ nounin unison
  a. if people speak or do something in unison, they say the same words at the same time or do the same thing at the same time:
    ‘Good morning!’ the kids replied in unison.
  b. if two groups, governments etc do something in unison, they do it together because they agree with each other:
    Management and workers must act in unison to compete with foreign business.

uni·sonBrE /ˈjuːnɪsn/ 🔊NAmE /ˈjuːnɪsn/ 🔊 noun●in ˈunison (with sb/sth)if people do or say sth in unison, they all do it at the same time （做事、说话）一起，一齐if people or organizations are working in unison, they are working together, because they agree with each other 一致行动；协调地(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

uni·sonBrE /ˈjuːnɪsn/ 🔊NAmE /ˈjuːnɪsn/ 🔊 noun●in ˈunison (with sb/sth)if people do or say sth in unison, they all do it at the same time （做事、说话）一起，一齐if people or organizations are working in unison, they are working together, because they agree with each other 一致行动；协调地(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