Definition of "18-wheeler" [18-wheeler]

• A big rig truck: a semi-trailer plus the truck or tractor pulling it. (noun)

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• ""We're a nation of 40 million against islands with only a couple of thousand inhabitants, that's like an 18-wheeler bearing down on a bicycle.""
• "This is like riding on a motorcycle and going right in front of an 18-wheeler."
• "Finally, the fully assembled car was loaded onto an 18-wheeler and hauled 350 miles to central Alabama."