More arrogant, conceited, or cocky; the comparative form of 'coxy' or 'coxie'.
From 'coxy' (also spelled 'coxie'), meaning arrogant or conceited, which may derive from 'cock' (rooster, symbol of arrogance) or be influenced by 'coxswain' (a traditionally commanding, somewhat self-assured role).
The association between roosters and arrogance is ancient—'cocky' and 'coxier' both play on the rooster's puffed-up, proud demeanor, showing how our language loves to use animal behavior as a mirror for human personality flaws!
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