firing on all four cylinders






firing on all cylinders = firing on all four cylinders

working or functioning at a peak level

This expression is a metaphor from an internal-combustion engine. A cylinder is said to be firing when the fuel inside it is ignited.

1998 - Entertainment Weekly - Even when his imagination isn't firing on all cylinders, Amis is still worth picking up, if only to enjoy the jazzy rhythm of his prose.




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