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To do the same thing without prior consultation or agreement
Neutral
她一讲完,大家不约而同都鼓起掌来 | Tā yī jiǎng wán, dàjiā bùyuē'értóng dōu gǔ qǐ zhǎng lái
The moment she finished speaking, everyone simultaneously burst into applause
[Source]
星期天,我和同学们不约而同地来到了公园 | Xīngqítiān, wǒ hé tóngxuémen bùyuē'értóng de lái dàole gōngyuán
On Sunday, my classmates and I happened to go to the same park by coincidence
[Source]
None
None
This is a new HSK chengyu
《史记》(Shǐ Jì), or the famous work "Records of the Grand Historian" by 司马迁 (Sī Mǎ Qiān).
This chengyu comes from a line in the work listed in the "Origin" section above