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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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Aug 7 Word of the Day
A celebrity free pass is an agreement between you and your significant other that if you meet said celebrity and there is an opportunity to sleep with them, your partner cannot get mad at you for doing so because you had agreed before hand that this person was your celebrity free pass. It is ideal if both of you in the relationship choose a celebrity free pass so that the playing field is even.
Julia met Drake at a bar, and hooked up with him, knowing that her significant other could not be mad at her, because Drake was her celebrity free pass.
by gingerale011 March 25, 2011
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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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