漏網之魚 [－网－鱼]

Jyutping lau6 mong5 zi1 jyu4
Pinyin lòu wǎng zhī yú

Definitions (CC-CEDICT)
  1. a fish that escaped the net (idiom)
  2. (fig.) sb or sth that slips through the net
Definitions (粵典–words.hk)
  1. 名詞
    僥​倖​逃​離圍​捕​嘅​人​；​形容​走​甩​咗​嘅​罪犯​或者​敵人
    person who has escaped from being caught; literally: fish that has slipped through a net
Definitions (Wiktionary)
  1. phrase, idiomatic
    people that are able to escape legal sanctions by luck