doublesystem
nounUK /ˈdʌbəl ˈsɪstəm/
US /ˈdʌbəl ˈsɪstəm/
A double system is when two things work together as a team.
The school bus uses a double system with two drivers taking turns.
OTHER MEANINGS
2. A setup where two machines or parts do the same job so one can help if the other stops.
The airplane has a double system for its lights.
3. A way of doing something that uses two separate groups or methods at once.
The game uses a double system of points and stars.
4. Two connected parts that must both work for the whole thing to work.
The bike's brakes are a double system, with one for each wheel.