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Jyutping bat1 joek3 ji4 tung4
Pinyin bù yuē ér tóng

Definitions (CC-CEDICT)
  1. to agree by chance (idiom); taking the same action without prior consultation
Definitions (粵典–words.hk)
  1. 語句
    咁​啱​諗​埋​或者​做​埋​同一​樣野
    acting or thinking in the same way without prior consultation or agreement; of similar thinking
    • 佢哋聽到呢個好消息,不約而同唱起國歌。
      佢哋听到呢个好消息,不约而同唱起国歌。
      keoi5 dei6 teng1 dou2 nei1 go3 hou2 siu1 sik1, bat1 joek3 ji4 tung4 coeng3 hei2 gwok3 go1.
      When they heard the good news, they coincidentally both started singing the national anthem.
Definitions (Wiktionary)
  1. phrase, humorous, idiomatic, neologism, slang
    to become gay or lesbian after a long period without dating
  2. phrase, idiomatic
    to happen to coincide; to take the same view or action without previous consultation
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #301
Examples (粵典–words.hk)
  1. Cantonese
    佢哋听到呢个好消息,不约而同唱起国歌。
    佢哋聽到呢個好消息,不約而同唱起國歌。
    keoi5 dei6 teng1 dou2 nei1 go3 hou2 siu1 sik1, bat1 joek3 ji4 tung4 coeng3 hei2 gwok3 go1.
    • When they heard the good news, they coincidentally both started singing the national anthem.
Examples (Wiktionary)
  1. Mandarin
    「大Q」与非法入境者交手(illegal immigrant,俗称II)经验丰富,众人不约而同认为,录取警诫口供的过程最困难。
    「大Q」與非法入境者交手(illegal immigrant,俗稱II)經驗豐富,眾人不約而同認為,錄取警誡口供的過程最困難。
    “ DàQ ” yǔ fēi fǎ rù jìng zhě jiāo shǒu ( illegal immigrant , sú chēng II ) jīng yàn fēng fù , zhòng rén bù yuē ér tóng rèn wèi , lù qǔ jǐng jiè kǒu gōng de guò chéng zuì kùn nán .
    • X
  2. Mandarin
    有几位网暴受害者不约而同地提到电影《让子弹飞》,电影里六子被哄骗著剖开了肚子,证明自己只吃了一碗粉,而当他真的取出一碗粉,围观起哄的人群却散去了。
    有幾位網暴受害者不約而同地提到電影《讓子彈飛》,電影裏六子被哄騙著剖開了肚子,證明自己只吃了一碗粉,而當他真的取出一碗粉,圍觀起鬨的人羣卻散去了。
    yǒu jǐ wèi wǎng bào shòu hài zhě bù yuē ér tóng dì tí dào diàn yǐng “ ràng zǐ dàn fēi ” , diàn yǐng lǐ liù zǐ bèi hǒng piàn zhù pōu kāi le dù zǐ , zhèng míng zì jǐ zhǐ chī le yī wǎn fěn , ér dāng tā zhēn de qǔ chū yī wǎn fěn , wéi guān qǐ hǒng de rén qún què sàn qù le .
    • A few victims of cyberbullying coincidentally referred to the movie Let the Bullets Fly, in which Liuzi was coaxed into cutting his stomach to prove that he had only eaten one bowl of noodles, and when he did take out a bowl of noodles, the crowd of onlookers and uproarers dispersed.