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English

1. you have my word; cut one's head off and let another person sit on it as a chair; an exaggerated expression used in bets to show how confident one is

粵語 — Cantonese

1. 攞嚟同人打賭；用嚟表達對自己嘅估計或諾言非常有信心，因為咁有信心所以用咩方法輸賭都得

Examples

• 如果佢準時出現，我就批個頭落嚟俾你當凳坐。

  I'll eat my hat (literally 'I'll cut my head off and let you sit on it as a chair') if he shows up on time.

• 我月尾一定還到錢㗎喇，唔係到時批個頭畀你當凳坐。

  I will return the money at the end of the month for sure. You have my word.