钻空子

Traditional (Taiwan): 鑽空子

zuānkòngzi ㄗㄨㄢ ㄎㄨㄥˋ ˙ㄗ

    • to take advantage of a loophole to exploit an advantage to seize the opportunity (esp. to do sth bad)

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
to drill into a gap
Meaning
To exploit a loophole or a weak point for one's own benefit. Critical. Close to 'find a loophole'.

Sources