Noun
unwritten rule (plural unwritten rules)
An unspoken rule.
There is a misleading, unwritten rule that states if a quote giving advice comes from someone famous, very old, or Greek, then it must be good advice. Bo Bennett
There's a basic rule which runs through all kinds of music, kind of an unwritten rule. I don't know what it is. But I've got it. Ron Wood
It's like there's some unwritten rule that if you're mates, you can say what you want to each other, and you don't really get that annoyed about it. Karl Pilkington
It's an unwritten rule - girl friends' boyfriends are off limits, even after they break up. Kristin Cavallari
That's the unwritten rule in hip-hop. If I get on a record with you, I want to smash you. That's it. Every MC knows that. If I'm on a track with you, I want to be the best on the track. That's just how it is in hip-hop. Ja Rule
Let us agree here today to adopt among ourselves a simple and unwritten rule. We will not rise to criticize someone else's idea unless we are prepared to offer an alternative idea of our own. Marco Rubio