certainbrake
nounUK /ˈsɜːtənbreɪk/
US /ˈsɜːrtənbreɪk/
A certainbrake is a special brake that always stops a thing safely.
The bike had a certainbrake that stopped it every time.
OTHER MEANINGS
2. A person or thing that surely slows down progress.
The long meeting was a certainbrake on our project.
3. A device that guarantees a machine will not roll away.
The cart's certainbrake kept it still on the hill.
4. A firm rule that stops something from going too far.
The new law acted as a certainbrake on speeding.