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Jyutping hoi1 pun4 hau2
Pinyin kāi pán kǒu

Definitions (粵典–words.hk)
  1. 動詞
    莊家開​賭局​或者​開個​賠率​出​嚟
    to offer odds
    • 我開個盤口,估下邊個會去選下屆特首。
      我开个盘口,估下边个会去选下届特首。
      Let me set up a bet, to see who will run for chief executive next term.

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Jyutping hoi1 pun4 hau2
Pinyin kāi1pan kǒu

Definitions (CC-CANTO)
  1. to open a book or to offer odds (in gambling) [colloquial]