hit on all cylinders

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.
Categories: informal verb

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