心sam1中zung1有jau5數sou3

English

1. to know what's going on
2. one who had made a decision within
3. to know exactly what's going on without expressing explicitly; to know the ins and outs of sth; literally: there is a sum in one's mind; combined with 啞仔食雲吞 (aa2 zai2 sik6 wan4 tan1) to form a sandwich pun

粵語 — Cantonese

1. 毋須明示，已經知道係件事係點；亦都同「啞仔食雲吞」組成歇後語

Examples

• 你做過咩衰嘢自己心中有數啦。

  You know exactly what evils you've done.

• 男人老不老,自己心中有数;女人老不老,别人一目了然.

  A man is as old as he feels and a woman as old as she looks.

  Tatoeba · zhouj1955 CC BY