droppedrule
nounUK /ˈdrɒpt ruːl/
US /ˈdrɑːpt ruːl/
A rule that someone forgot to follow or stopped using.
The teacher noticed a droppedrule when the kids ran in the hall.
OTHER MEANINGS
2. A rule that was removed on purpose.
The old droppedrule about hats is gone now.
3. A game rule that players skip by accident.
We played with a droppedrule and the game got silly.
4. A rule that no longer works for a group.
That droppedrule was too hard, so they made a new one.