Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: cock word used to avoid saying 'God' (14-19 centuries) + sure

cocksure

 adjective
     
cock‧sure old-fashioned
too confident of your abilities or knowledge, in a way that is annoying to other people:
He seemed rather too cocksure for my liking.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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