bosu ball

/ˈboʊsu ˌbɔl/

noun

A piece of exercise equipment with an inflated rubber dome attached to a rigid flat platform, used for balance training, strength exercises, or rehabilitation.

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Meanings

nounbosu ball (plural bosu balls)

plural bosu balls · alternative Bosu ball · alternative BOSU ball · alternative Bosu trainer

  1. A piece of exercise equipment with an inflated rubber dome attached to a rigid flat platform, used for balance training, strength exercises, or rehabilitation.

    Then you are an idiot who will always have stork limbs and a flabby body. Get back on your bosu ball. More protein won’t help this guy!!

    2016 December 14, “Protein”, in Ultimate Performance Blog, archived from the original on 26 Jul 2021
    1 more example

    The Bosu ball is essentially a Swiss ball chopped in half and mounted upon a flat board, creating a non-stable yet not particularly threatening environment. The balance or core board is another destabilizing device that could also be used.

    2004, Thomas Boettcher, Core Training: For Greater Strength and Better Health, Sterling Publishing Company, Inc., →ISBN, page 68

Origin

Partial genericized trademark from BOSU, an acronym for "Both Sides Utilized" describing the two usable surfaces (a flat platform and inflated dome) of products like the BOSU Balance Trainer, plus ball.

Full word history & related roots →
Cite this entry
APA

bosu ball. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/bosu%20ball

MLA

“bosu ball.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/bosu%20ball. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “bosu ball,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/bosu%20ball.

Source: bosu ball on Wiktionary, CC BY-SA 4.0.