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From cock(corruption of the word God) +‎ sure, early 16th c.


cocksure (comparative more cocksure, superlative most cocksure)

  1. (informal) too confident; overconfident
    I thought myself cocksure of the horse which he readily promised me. — Alexander Pope.
    • 1906, John Galsworthy, The Man of Property, preface
      The persistence of the Past is one of those tragicomic blessings which each new age denies, coming cocksure on to the stage to mouth its claim to a perfect novelty.
    • 1920, Sinclair Lewis, The Main Street, chapter 23
      These crack specialists, the young scientific fellows, they're so cocksure and so wrapped up in their laboratories that they miss the human element.