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be all that
To be remarkably adept, intelligent, good-looking, or successful. Primarily heard in US, South Africa. I don't need to see his test results, I already know he's all that!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. Too, very, usually employed in a negative context meaning not too, not very. For example, The new house is not all that different from your old one. [Mid-1900s] Also see none too.
2. That and everything else of the kind. For example, She enjoys wearing nice clothes and perfume and all that. [c. 1700] Also see and all.
3. See for all that.
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.
To the degree expected.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.