in one's mind; in one's heart to know exactly how things stand; to have a definite idea of what one is doing trad. (心中有數) 心中 有數 simp. (心中有数) 心中 有数 Literally: “to have a number in one's heart”.
- to know very well in one's heart (e.g. what to do next, whether it is likely to succeed, etc.); to know the score