In the Book of Job, behemoth (from Hebrew via Middle English and Late Latin) describes a mysterious beast that resides in the current of a raging river. The clues given about the creature’s description—that it “feeds on grass like an ox”; that the “sinews of its thighs are close-knit”; and that its tail “sways like a cedar”—has led some biblical scholars to conclude that the creature in question may have been a hippopotamus.
Now behemoth is used to refer to something that is either physically large (like an oversized truck) or simply has a large presence:
Chinese sportswear maker Li Ning, for instance, has spent heavily to promote its brand and challenge behemoths Nike and Adidas, even hiring NBA superstar Dwyane Wade last year to market a line of sneakers and apparel.
— Michael Schuman, Time, 18 Nov. 2013
Some writers have also used the word in a way that gives the perception that behemoths are slow and clumsy:
Only her family knew she was lazy as a behemoth, untidy about her person, and as sentimental as a hungry shark.
— Edna Ferber, “The Maternal Feminine,” in One Basket, 1919