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have all one's buttons

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Also, have all one's marbles. Be completely sane and rational. For example, Grandma may be in a wheelchair, but she still has all her buttons, or I'm not sure he has all his marbles. These slangy expressions date from the mid-1800s, as do the antonyms lose or be missing some of one's buttons or marbles, meaning “become (or be) mentally deficient.”

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Which of the following words describes “sky blue”?
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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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