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English

1. (adj.) describes someone who is an adult and should act like one.
2. a grown-up; used to criticise childish behaviour

粵語 — Cantonese

1. 大個人，唔再係細路；用嚟批評成年人嘅思想或者行為似細路

Examples

• 大人大姐，幾毫子唔好計啦。

  (We are) grown-ups. Don't be so stingy with a few cents.

• 你大人大姐好心唔好同細路爭啦。

  Come on, you are a grown-up. Don't fight with the kids.

• 你大人大者就唔好再成日發脾氣啦。

  You are a grown-up. Don't always throw a tantrum.