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Jyutping hoi1 seng1
Pinyin kāi shēng

Definitions (CC-CANTO)
  1. to speak out; to request; the act of "opening" the voice before singing
Definitions (粵典–words.hk)
  1. 動詞
    開口​發出​聲音
    to start talking or singing
    • 佢一開聲我就知道係佢啦。
      佢一开声我就知道系佢啦。
      keoi5 jat1 hoi1 seng1 ngo5 zau6 zi1 dou3 hai6 keoi5 laa1.
      I know it's him once he starts talking.
  2. 動詞
    引申​指發​表意​見​、​指出​問題​、​表示​支持
    to speak up; to voice out (to express concern or to support someone, etc.)
    • 開到聲
      开到声
      hoi1 dou3 seng1
      to say something explicitly
    • 佢終於開聲支持自己老婆。
      佢终于开声支持自己老婆。
      keoi5 zung1 jyu1 hoi1 seng1 zi1 ci4 zi6 gei2 lou5 po4.
      Finally, he speaks up for his wife.
  3. 動詞
    開着​電子裝​置​嘅​響​聲​或者​音量
    to turn on the ringtone or volume of a device
    • 有咩就打字啦,返工唔可以開聲。
      有咩就打字啦,返工唔可以开声。
      jau5 me1 zau6 daa2 zi6 laa1, faan1 gung1 m4 ho2 ji5 hoi1 seng1.
      Type it out if you have anything to say. I can't turn on the volume during working hours.
    • 佢電話唔開聲,成日揾佢唔到。
      佢电话唔开声,成日揾佢唔到。
      keoi5 din6 waa2 m4 hoi1 seng1, seng4 jat6 wan2 keoi5 m4 dou2.
      His phone is always on silent mode and therefore he is always unreachable.
  4. 動詞
    正式​唱歌​之前​嘅​熱​身​,​唱​一​啲​簡​單​嘅​音​或者​做​一​啲​簡​單​嘅​練​習​,​用​嚟​熟習​唱歌​運聲
    vocal warm-up, an pre-performance exercise to fine-tune one's vocal muscles
    • 如果唔開聲就上台,會唱得好難聽。
      如果唔开声就上台,会唱得好难听。
      jyu4 gwo2 m4 hoi1 seng1 zau6 soeng5 toi4, wui5 coeng3 dak1 hou2 naan4 teng1.
      One's performance would be disastrous if he skipped his vocal warm-up.
Definitions (Wiktionary)
  1. verb, Cantonese
    to warm up one's voice
    (syn.) 开嗓, 開嗓
  2. verb
    to utter; to start speaking
  3. verb, Cantonese
    to speak up; to give voice
    (syn.) 出声, 出聲
Definitions (Kaifangcidian)
  1. 作聲 – 作声
  2. 吭聲 – 吭声
  3. 開口 – 开口
  4. 說話 – 说话
Examples (粵典–words.hk)
  1. Cantonese
    你唔开声我就当件事无数㗎喇,以后都唔好再提。
    你唔開聲我就當件事無數㗎喇,以後都唔好再提。
    nei5 m4 hoi1 seng1 ngo5 zau6 dong3 gin6 si6 mou4 sou3 gaa3 laa3, ji5 hau6 dou1 m4 hou2 zoi3 tai4.
    • If you didn't say anything then I regarded that you let the matter be. Don't mention it anymore.
  2. Cantonese
    佢一开声我就知道系佢啦。
    佢一開聲我就知道係佢啦。
    keoi5 jat1 hoi1 seng1 ngo5 zau6 zi1 dou3 hai6 keoi5 laa1.
    • I know it's him once he starts talking.
  3. Cantonese
    佢终于开声支持自己老婆。
    佢終於開聲支持自己老婆。
    keoi5 zung1 jyu1 hoi1 seng1 zi1 ci4 zi6 gei2 lou5 po4.
    • Finally, he speaks up for his wife.
  4. Cantonese
    有咩就打字啦,返工唔可以开声。
    有咩就打字啦,返工唔可以開聲。
    jau5 me1 zau6 daa2 zi6 laa1, faan1 gung1 m4 ho2 ji5 hoi1 seng1.
    • Type it out if you have anything to say. I can't turn on the volume during working hours.
  5. Cantonese
    佢电话唔开声,成日揾佢唔到。
    佢電話唔開聲,成日揾佢唔到。
    keoi5 din6 waa2 m4 hoi1 seng1, seng4 jat6 wan2 keoi5 m4 dou2.
    • His phone is always on silent mode and therefore he is always unreachable.