diraĵo

Decode it and the meaning falls out. Diri is to say, and -aĵ- is the suffix that makes a concrete thing out of whatever the root describes. Manĝi gives manĝaĵo, food. Nova gives novaĵo, a piece of news. Diri gives diraĵo, a said-thing. Once you can read the suffix you never need to look this one up, which is the whole argument of the word-building article.

Three senses, and the dictionary lists all three. The Reta Vortaro gives: something said, an utterance; a characteristic way of putting things, a turn of phrase; and a piece of hearsay. English needs three different words for that range and Esperanto needs one suffix.

The fence with proverbo. A proverbo is a fixed, traditional, quotable saying with an author only in the sense that everybody is its author. A diraĵo is any remark at all, including yours from five minutes ago. Translating saying into diraĵo is right when the saying is just a thing somebody said, and wrong when it is folk wisdom.

And the fence with onidiro. Onidiro decodes just as neatly: oni plus diro, what-people-say, a rumour. Diraĵo reaches into that territory in its third sense but does not live there. If you mean gossip specifically, onidiro says so and diraĵo only implies it. The impersonal constructions article covers why oni is the right subject for something nobody will own.