堵漏洞

dǔlòudòng ㄉㄨˇ ㄌㄡˋ ㄉㄨㄥˋ

    • to stop mistakes and abuses by fixing gaps in how work is done

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
plug a loophole
Meaning
To take steps to stop mistakes, accidents or abuses and to fix gaps in how work is done. Neutral or approving.

Sources