clockrule
nounUK /ˈklɒk.ruːl/
US /ˈklɑːk.ruːl/
A clockrule is a rule about what time something must happen.
The clockrule says we must be in bed by eight o'clock.
OTHER MEANINGS
2. A rule that tells you when to start or stop doing something.
The clockrule for the game says we stop when the buzzer rings.
3. A set time by which a job must be finished.
The clockrule for homework is that it must be done before dinner.
4. A family or school rule about times of day.
Our clockrule at school means no running in the halls after the bell.