fliprule
nounUK /ˈflɪp.ruːl/
US /ˈflɪp.ruːl/
A fliprule is a special rule that turns things around or changes them to the opposite.
The game had a fliprule that made the winner become the loser.
OTHER MEANINGS
2. A rule in a game that makes players do the reverse of what they normally do.
Under the fliprule, everyone had to walk backward instead of forward.
3. A sudden change in how something is decided or judged.
The teacher added a fliprule so the quietest team got the most points.
4. A trick rule that flips the meaning of a word or action.
The fliprule said that 'yes' meant 'no' for the whole round.