Firing on all cylinders
Meaning
To be performing at peak efficiency or with maximum energy and output.
Origin
Before the internal combustion engine revolutionized transportation, the idea of 'firing on all cylinders' didn't exist. Early multi-cylinder engines, first developed in the late 19th and early 20th centuries, relied on each cylinder to ignite its fuel and push its piston in sequence, creating continuous power. When an engine was running perfectly, every single cylinder was firing, contributing its full power without a miss, creating a powerful, smooth roar. A misfiring cylinder meant a loss of power, a sputtering sound, and inefficient operation. So, to be 'firing on all cylinders' quickly became a vivid metaphor for anyone, or anything, performing at their absolute best, working with maximum efficiency and energy, just like a perfectly tuned engine.
Examples
- After a good night's sleep, I woke up feeling refreshed and ready to start the project, firing on all cylinders from the moment I sat down.
- The marketing team was really firing on all cylinders, coming up with brilliant new ideas for the campaign every hour.