Meaning

2 senses
  1. (idiomatic)An entity that dominates its environment.

    Q: Where does an 800-pound gorilla sleep? A: Wherever it wants!

    Back then, the mayor was an 800-pound gorilla in this town.

  2. (idiomatic)Something dangerous, menacing, or frightening that is obvious but not addressed.

    Near-synonyms: elephant in the room, emperor's new clothes

    The mayor's abuse of his power was an 800-pound gorilla in polite conversation.

Origin

Attested since at least 1971, from a riddle: "Where does an 800-pound gorilla sleep?" / "A

Attested since at least 1971, from a riddle: "Where does an 800-pound gorilla sleep?" / "Anywhere it wants."

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800-pound gorilla — meaning, examples, forms, synonyms | Krumeto