- present progressive of bone (3rd person singular).
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Austrian Baron Rene Nebesky, who helps Rock, is boning up on Tibetan demonology.
From Time Magazine Archive
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At the moment he is boning up on his classical guitar and piano while he decides where, or even whether, to go to college.
From Time Magazine Archive
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