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swellhead

[swel-hed]
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noun
  1. a vain or arrogant person.
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Origin of swellhead

An Americanism dating back to 1835–45; swell + head
Related formsswell·head·ed, adjectiveswell·head·ed·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018