Dictionary![]() ![]() cock•surePronunciation: (kok'shoor', -shûr'), [key] —adj. 1. perfectly sure or certain; completely confident in one's own mind: She was cocksure that she was able to do the job better than anyone else. 2. too certain; overconfident: He was so cocksure he would win the election that he didn't even bother to campaign. 3. Obs.perfectly secure or safe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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