卒 (cù) is the less common reading of this character, used as a bound form meaning 'sudden' or 'abrupt' in compound words. It is distinct from the more frequent reading zú (soldier, to die, finally). You will encounter it in literary or medical contexts, such as 卒中 (cùzhòng, stroke) and 卒然 (cùrán, suddenly). Because 卒 (cù) is a bound form, it never stands alone; it always appears as part of a two-character word or set phrase.