tv. to promote, hype, or support something; to try to sell something aggressively. : Fred was flogging this car so hard, I figured he was trying to get rid of it.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
flog
1676, slang, perhaps a schoolboy shortening of L. flagellare "flagellate."