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An overbearing entity in a specific industry or sphere of activity. A seemingly unbeatable presence always to be reckoned with; whose experience, influence, and skill threatens to defeat competitors with little effort.
In the software industry, Microsoft would be considered the 800-pound gorilla.
The New York Yankees or Manchester United might be considered the 800-pound gorillas of their respective sports.

by xenolon June 18, 2006
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Feb 26 Word of the Day
Commonly used in text messages or social media as a short form for Very Sound Advice.
Mate 1: Hey, I'd be careful risking all that money on one bet. Only risk what you can afford to lose.
Mate 2: Thanks. VSA
by Sexucator February 08, 2021
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2
a very strong and/or menacing entity or issue that is obvious but not dealt with
Abuse suffered in prison is an 800-pound gorilla that is undermining justice.
by The Return of Light Joker April 13, 2009
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3
The big, dominant factor regarding some topic.
β€œI can’t think of anybody who had more impact than Dr. Dobson,” on rousing evangelicals to the polls, Richard Viguerie, a GOP direct-mail guru, recently told U.S. News & World Report. β€œHe was the 800-pound gorilla.”
by The Wu Factor November 15, 2005
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