pick-onerule
nounUK /ˈpɪk wʌn ruːl/
US /ˈpɪk wʌn rul/
A pick-one rule is a rule that says you must choose just one thing.
The teacher made a pick-onerule for the game so nobody could take two turns.
OTHER MEANINGS
2. A rule in a game that lets each player take only one item.
Under the pick-onerule, each kid got one candy from the bowl.
3. A family rule that says you may pick only one treat at the store.
Mom reminded us of the pick-onerule before we went shopping.
4. A voting rule where each person marks only one name.
The club used a pick-onerule so every member voted for a single leader.