'Pī xīng dài yuè' is a classical Chinese idiom that literally means 'to drape oneself with stars and wear the moon' — evoking the image of someone traveling or working so early and late that they depart before dawn (under stars) and return after dusk (beneath the moon). It vividly conveys relentless, tireless effort across day and night, often emphasizing dedication, hardship, or urgency.

This four-character idiom is commonly used in formal writing, news reports, and speeches to praise perseverance — especially for laborers, students preparing for exams, medical staff during crises, or entrepreneurs launching ventures. Though poetic and figurative, it's not archaic; modern speakers use it sincerely to highlight extraordinary commitment. The structure follows a parallel verb-object pattern: 披 (to drape) + 星 (stars), 戴 (to wear) + 月 (moon), reinforcing symmetry and rhythm typical of classical idioms.