大掃除

Simplified: 大扫除

dàsǎochú ㄉㄚˋ ㄙㄠˇ ㄔㄨˊ

    • a large-scale clean-up or purge
    • a thorough spring clean

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
big sweep-out
Meaning
A large-scale clean-up or purge of an organisation or problem. Also a literal thorough house cleaning.

Sources