A metaphor from an internal-combustion engine; a cylinder is said to be firing when the fuel inside it is ignited. https://www.encyclopedia.com/humanities/dict

A metaphor from an internal-combustion engine; a cylinder is said to be firing when the fuel inside it is ignited. https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/firing-all-four-cylinders https://www.encyclopedia.com/humanities/dictionaries-thesaur...