unwritten rule

unwritten rule

A law, provision, or guideline that is generally accepted but not formally established or enforced. It's become something of an unwritten rule that people from different departments only sit together during lunch. It's just an unwritten rule that a new president will make his previous tax returns public—seems kind of suspicious if they don't. The unwritten rule for many years was that successful athletes were given free passes for bad behavior or poor grades, so long as they remained successful in their sport.
See also: rule, unwritten
Farlex Dictionary of Idioms.
See also:
  • unwritten
  • unwritten law
  • in force
  • in force/strength
  • lodge
  • lodge (something) against
  • lodge against
  • rule of thumb
  • a rule of thumb
  • an iron curtain
References in periodicals archive
The Ireland head coach has always had an unwritten rule that players who move overseas will all but end their international careers - but he's also said that players could still be selected in an 'emergency'.
it's no go for zebo
"Was there a bit of an unwritten rule that it wasn't discussed in the dressing room?" Sheringham says in his Utd Unscripted piece on the club's website.
'United had unwritten rule to ban Treble talk'
R03: Is there a standard unwritten rule development process for hockey players?
The Rookie Experience: The Initiation of Unwritten Rule Development in Men's Ice Hockey
It was, she insisted, an "unwritten rule" among colleagues.
Sacked worker's claims backed by 21 colleagues
As Levitsky and Ziblatt explain, it was adherence to this unwritten rule that allowed American democracy to prosper for much of the 20th century, while it was the breakdown of this very norm that led to Donald Trump and the increasing polarisation that makes up American democracy today.
The norms that guide us
Vaughan said Australia had broken an unwritten rule by taking an object onto the pitch to tamper with the ball even though he admitted many teams used"tricks"during matches.
Vaughan 'pretty sure'Australia tampered with ball during Ashes
I know you can't help who you fall in love with, but the unwritten rule has been broken - nothing should come between friendship.
you say
"There is an unwritten rule and as long as that is maintained then fine, but I am not sure it has.
Aussie sledging is 'crossing the line'
And afterwards String broke his own "unwritten rule" by getting up to perform after a daytime drinking session.
Sting sings to jazz club crowd after long day of drinking
* Unwritten Rule #1 is that the target has to laugh along with the joker.
The no joke zone
Jobs for the boys all round, and with the unwritten rule that the First Minister must speak Welsh.
Look out,Welsh is now to be coerced; Views of Wales
Nocturnal predators are rousing from their slumbers, About to slay quarry in large numbers, Nature heartless and cruel, "Dog eat dog" the unwritten rule.
Your Poem
There is no rule against the full-court press, it's just an unwritten rule that most teams retreat to their own end of the floor to set up their half-court defense instead of immediately launching into a fast-paced defensive strategy.
Break the unwritten rules
According to former ambassador Ljupco Arsovski, on the other hand, this has nothing to do with the election campaign since it's an unwritten rule for Greek presidents to make such statements whenever they visit northern Greece.
Utrinski vesnik's Slobodanka Jovanovska wonders what makes Greek President Prokopis Pavlopoulos defend the Greekness of Macedonia every other day when nobody in Macedonia mentions it let alone attacks it and the name issue is not even a topic in the election campaign
Graham is a man of great integrity with a record of bringing black players through, but in my heart of hearts it wouldn't surprise me if a former England manager one day admits that, yes, there was this unwritten rule.
RACE ROW IS NO SURPRISE