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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cocksure is an adjective meaning "marked by excessive confidence". It carries one recorded sense.
marked by excessive confidence
“an arrogant and cocksure materialist”
“so overconfident and impudent as to speak to the queen”
“the less he knows the more positive he gets”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for cocksure come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.