unison

un-, 一，词源同unit,-son,声音，词源同sound。即同一个声音，引申义一致，协调。

unison

unison: [16] Unison originated as a musical term, denoting ‘of the same sound’. It comes via Old French unison from late Latin ūnisonus, a compound adjective formed from ūnus ‘one’ and sonus ‘sound’ (source of English sound). The metaphorical sense ‘agreement, concord’ emerged in the 17th century.
=> sound

unison (n.)

1570s, "note having the same pitch as another; identity in pitch of two or more sounds; interval between tones of the same pitch," especially the interval of an octave, from Middle French unisson "unison, accord of sound" (16c.) or directly from Medieval Latin unisonus "having one sound, sounding the same," from Late Latin unisonius "in immediate sequence in the scale, monotonous," from Latin uni- "one" (see one) + sonus "sound" (see sound (n.1)). Figurative sense of "harmonious agreement" is first attested 1640s.

1. 72,000 pairs of hands clapped in unison to the song.

72,000双手和着歌曲整齐划一地打着拍子。

2. The international community is ready to work in unison against him.

国际社会准备联手反对他。

3. The governments acted in unison to combat terrorism.

这些国家的政府一致行动对付恐怖主义.

4. They ran together, their legs moving in unison.

他们步调一致地一起跑.

5. Unison and the other unions have the power to hold the Government to ransom.

公务员工会和其他工会有能力胁迫政府。