800-pound gorilla

noun
\ˈāt-ˈhən-drəd-ˈpau̇nd-, -dərd-\

Definition of 800-pound gorilla 

: one that is dominating or uncontrollable because of great size or power like it or not, the 800-pound gorilla usually sets the standard— Daya Nadamuni

First Known Use of 800-pound gorilla

1976, in the meaning defined above

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The first known use of 800-pound gorilla was in 1976

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