n. a long, heavy, black segment of the outside of a tire, usually a truck tire, found on the highway. : We dodged off onto the shoulder to avoid running over an alligator. , A gator bashed in the bottom of my gas tank.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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(gā'tər) 
tər