Most arrogant, conceited, or cocky; the superlative form of 'coxy' or 'coxie'.
Superlative form of 'coxy,' formed by adding -est. The root 'coxy' likely stems from 'cock' (rooster) referring to cocky behavior, or possibly influenced by the authoritative role of a coxswain.
English speakers formed this comparative/superlative pair (coxier, coxiest) the old-fashioned way before -y adjectives started using 'more/most'—it's a relic of how 17th-18th century speakers described arrogant people!
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