sure of oneself

sure of oneself idiom
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® 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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