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Why turkey has the same name as Turkey

sure of oneself

Self-confident, as in Now that Mary's graduated she's much more sure of herself. This expression uses sure in the sense of “confident” or “secure,” a usage dating from the mid-1400s.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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