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Jyutping jan2 zeon3 bat1 gam1
Pinyin rěn jùn bù jīn

Definitions (粵典–words.hk)
  1. 語句、書面語
    忍​唔​住​笑​。
    cannot help laughing
    • 呢套卡通片真係令人忍俊不禁!
      呢套卡通片真系令人忍俊不禁!
      ne1 tou3 kaa1 tung1 pin3 zan1 hai6 ling6 jan4 jan2 zeon3 bat1 gam3!
      This cartoon really makes me laugh so hard!

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Jyutping jan2 zeon3 bat1 gam3
Pinyin rěn jùn bù jīn

Definitions (CC-CEDICT)
  1. cannot help laughing
  2. unable to restrain a smile
Definitions (Wiktionary)
  1. phrase, idiomatic
    to fail to keep from laughing
Examples (粵典–words.hk)
  1. Cantonese
    呢套卡通片真系令人忍俊不禁!
    呢套卡通片真係令人忍俊不禁!
    ne1 tou3 kaa1 tung1 pin3 zan1 hai6 ling6 jan4 jan2 zeon3 bat1 gam3!
    • This cartoon really makes me laugh so hard!