fuel [ˈfjuwəɫ]noun 3verb 2forms 5phrases 2 noun3 •material that is burned or used up in some other way to give energyMore than a mere source of Promethean sustenance to thwart the cold and cook one's meat, wood was quite simply mankind's first industrial and manufacturing fuel. — 2006 •Substance that provides nourishment for a living organism; food.A little fuel to get down the mountain. — 2021 •(figurative) Something that stimulates, encourages or maintains an action.His books were fuel for the revolution.Money is the fuel for economy. verb2 •To provide with fuel.The workings now employ ten twin-units, which are fuelled at Hornsey but return to Cambridge diesel depot for their weekly maintenance; [...]. — 1959 •To exacerbate, to cause to grow or become greater.One detail that has fueled speculation for over a decade is the tyre tracks, which show the Highlander accelerated as it went down the embankment rather than braking. — 2026 formsfueled · fuelled · fueling · fuelling · fuels Phrases with fuel add fuel to the fireTo worsen a conflict between people; to inflame an already tense situation. fuel upTo eat hurriedly in order to do something more interesting.