18-wheeler(redirected from 18)
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A tractor-trailer that has 18 wheels. Be careful changing lanes, there's an 18-wheeler coming up behind you.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a large trailer truck. (There are a total of eighteen wheels on the cab and trailer.) An eighteen-wheeler almost ran me off the road.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.