冇明文規定嘅規則;通常指啲唔公平或者唔道德嘅慣常做法 (unwritten rule; unspoken rule; usually implies unfair or even unethical practices)
名詞用例
呢個行業嘅潛規則,就係要識擦鞋,唔係幾叻都冇用。
nei1 go3 hong4 jip6 ge3 cim4 kwai1 zak1, zau6 hai6 jiu3 sik1 caat3 haai4, m4 hai6 gei2 lek1 dou1 mou5 jung6.
The unwritten rule in this industry is that you have to know how to "bootlick"; otherwise you'd get nowhere regardless of how talented you are.