‘病假’ (bìng jià) literally combines ‘病’ (bìng), meaning 'illness' or 'sickness', and ‘假’ (jià), meaning 'leave' or 'holiday'. Together, it refers specifically to formal, approved time off from work or school due to personal illness. It is a compound noun used in institutional contexts — employers, schools, and government offices all recognize 病假 as a legitimate category of absence, often requiring medical documentation for longer durations.

This term carries a neutral-to-formal register and is not used for casual or unofficial sick days. Unlike general terms like ‘请假’ (qǐng jià, 'to ask for leave'), 病假 explicitly signals the medical reason behind the absence. It’s commonly discussed in HR policies, student handbooks, and workplace communications in China and other Mandarin-speaking regions.