White plus black refers to day and night.

Five plus two means five working days from Monday to Friday, plus Saturday and Sunday on weekends.

It means 24 hours a day, and it is often used to describe that there is no rest time at work and I have been busy.

Extended data synonyms

1, day and night? 【 yǐ jiri 】 describes day and night. Work or study etc. Mencius Li Lou: "Think about it day and night."

Source: "Zhuangzi Zhile": "Fu Gui; Day and night; Think about it. "

2. All night? [t not ngxi ā odá dà n] All night; From darkness to dawn.

Source: Feng Ming Menglong's "Awakening the World": "The Lion People Society Fire; Drums and gongs; All night. "