hit on all cylinders
hit on all cylinders {v. phr.}
1. To run smoothly or at full power without any missing or skipping. — Said of a motor.
The mechanic tuned the car engine until it was hitting on all cylinders.
2. {informal}
To think or work well; to use all your ability.
The football team was hitting on all cylinders and scored a big victory.
Bob began to write his examination, and found himself hitting on all cylinders.
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Source: A Dictionary of American Idioms