800-pound gorilla

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.

800-pound gorilla by xenolon June 19, 2006

800-pound gorilla

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.

800-pound gorilla by The Return of Light Joker April 13, 2009

800-pound gorilla

The big, dominant factor regarding some topic.

“I 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. “He was the 800-pound gorilla.”

800-pound gorilla by The Wu Factor November 16, 2005