指腹為婚 [－－为－]

Jyutping zi2 fuk1 wai4 fan1
Pinyin zhǐ fù wéi hūn

Definitions (粵典–words.hk)
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指腹為婚 [－－为－]

Jyutping
Pinyin zhǐ fù wéi hūn

Definitions (CC-CEDICT)
  1. to propose the future marriage of two unborn babies on condition that one turns out to be a boy, and the other, a girl (idiom)