"800-pound gorilla" is an American English expression for an entity so powerful that it can act without regard to the rights of others or the law.[1] The phrase is rooted in a riddle joke:
Q. Where does an 800-pound gorilla sit?
A. Anywhere it wants to.
This highlights the disparity of power between the gorilla and ordinary humans. 800 pounds are approximately 360 kg.
The term can describe a powerful geopolitical and military force, or, in business, a powerful corporate entity that has such a large majority percentage of whatever market they compete within that they can use that strength to crush would-be competitors. In law, the phrase occurs as a characterization of judges vs. courts; as in: "Standard/Court Rule" vs "Gorilla/Judge Rule".[2]