COCKSURE

PRONUNCIATION: (KOK-shoor, kok-SHOOR)

MEANING: adjective: Arrogantly or presumptuously overconfident.

ETYMOLOGY: From cock (a euphemism for god) + sure, from Old French seur, from Latin securus (secure). Earliest documented use: 1520.
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MOCKSURE - bravado

CORKSURE - a product marketed to guarantee fizz tomorrow in the soda bottle you open today

COCKLURE - a fertile hen