Merriam-Webster's Collegiate® Dictionary, 11th Edition
SWAGGER
I. verb (swaggered; swaggering)
Etymology: probably from 1swag + -er (as in chatter)
Date: circa 1596
intransitive verb to conduct oneself in an arrogant or superciliously pompous manner, boast , brag , transitive verb to force by argument or threat ; bully , swaggerer noun swaggeringly adverb
II. noun
Date: 1725
1. an act or instance of swaggering, arrogant or conceitedly self-assured behavior, ostentatious display or bravado, a self-confident outlook ; cockiness,
III. adjective
Date: 1879
marked by elegance or showiness ; posh