one-onlyrule
nounUK /wʌn ˈəʊnli ruːl/
US /wʌn ˈoʊnli ruːl/
A one-onlyrule is a rule that says you can have just one of something.
The club has a one-onlyrule, so each kid can bring only one toy.
RELATED WORDS
OTHER MEANINGS
2. A game rule that lets each player take just one turn or one piece.
In this board game, the one-onlyrule means you move one space and stop.
3. A store policy that each customer may buy only one of a special item.
Because of the one-onlyrule, nobody could buy two of the rare cards.
4. A fairness rule that gives everyone exactly one share.
The teacher used a one-onlyrule so every child got one sticker.