swaggering

Concise Oxford English Dictionary © 2008 Oxford University Press:
swagger/ˈswaɡə(r)/

▶verb walk or behave arrogantly or self-importantly. ▶noun an arrogant or self-important gait or manner. ▶adjective

• 1 denoting a coat cut with a loose flare from the shoulders.

• 2 Brit. informal, dated smart or fashionable.

– derivatives
swaggerer noun,
swaggering adjective,
swaggeringly adverb.

– origin C16: appar. a frequentative of the verb swag.