sparerule
nounUK /ˈspɛəruːl/
US /ˈspɛrruːl/
A sparerule is an extra rule you can use when you need one.
The teacher kept a sparerule in her desk for special games.
RELATED WORDS
OTHER MEANINGS
2. A rule kept in reserve in case the main rule fails.
If the first rule breaks, the sparerule takes over.
3. An additional rule added to a game for fairness.
They added a sparerule so everyone got a turn.
4. A spare part shaped like a ruler.
He used a sparerule to fix the broken shelf.