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Bone Up on It

Posted by Bruce Kahl on October 29, 2000

I told my teenage offspring that I could not provide taxi service for them today 'cause I have to "bone up" on a certain subject for an extremely important meeting this week.
I know of "bone dry" and "make no bones about it" and even a "bone of contention" but does anybody know why reaquainting yourself with a certain body of knowledge is called "boning up"???