Simple Definition of BO

from our Learner's Dictionary

BO

abbreviation

body odor
She refused to wear deodorant and had horrible BO. [=her body smelled very unpleasant]

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“BO.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/BO. Accessed 4 Jun. 2026.

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