all there

all there idiom
Having one's wits about one, mentally competent, as in John may seem absentminded, but believe me, he's all there. This phrase is often used negatively, as not all there, for being without one's full faculties. For example, I wonder about Justin; sometimes it seems as if he's not all there. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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