A vehicle or tank used to transport and deliver liquids like water or fuel, especially at airfields or construction sites.
From Leal Bowser, an American inventor who created a fuel-dispensing system in the early 1900s. The proprietary name became genericized as a common noun for any similar tank vehicle.
A man's name became so synonymous with fuel trucks that today 'bowser' is the standard term in British English—it's a rare case of a surname replacing the generic term for an entire machine.
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