MDBG: to stop before going too far (idiom); to stop while one can; don't overdo it; stop while you're ahead
LDC:
CDict: '
Click icons for complete source definitions (not available on mobile). icon in each entry gives source attribution. Want to improve this definition? Check to see if 适可而止 is already in CC-CEDICT. If not, you can add it. (Why?)