沒有不透風的牆 [没－－－风－墙]

Jyutping mut6 jau5 bat1 tau3 fung1 dik1 coeng4
Pinyin méi yǒu bù tòu fēng de qiáng

Definitions (Wiktionary)
  1. proverb, figuratively
    no secret can be kept forever
    (syn.) 雞春咁密都菢得出崽, 鸡春咁密都菢得出崽

沒有不透風的牆 [没－－－风－墙]

Jyutping
Pinyin méi yǒu bù tòu fēng de qiáng

Definitions (CC-CEDICT)
  1. (idiom) no secret can be kept forever