补漏洞

Traditional (Taiwan): 補漏洞

bǔlòudòng ㄅㄨˇ ㄌㄡˋ ㄉㄨㄥˋ

    • to fix gaps or flaws in a plan or system
    • to plug loopholes

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
patch up a hole
Meaning
To fix gaps or flaws in a plan or system. The book says it is usually written 堵漏洞 (plug the loopholes).

Sources