扫死角

Traditional (Taiwan): 掃死角

sǎosǐjiǎo ㄙㄠˇ ㄙˇ ㄐㄧㄠˇ

    • to clean up neglected areas
    • to take control of unmanaged spots

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
sweep the dead corners
Meaning
To clean up or take control of areas usually left unmanaged, in campaigns of tidying and regulation. Official-sounding.

Sources