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.