The Collaborative International Dictionary of English v.0.48:
Swagger \Swag"ger\, v. i. [imp. & p. p. Swaggered; p. pr. &
vb. n. Swaggering.] [Freq. of swag.]
1. To walk with a swaying motion; hence, to walk and act in a
pompous, consequential manner.
A man who swaggers about London clubs.
2. To boast or brag noisily; to be ostentatiously proud or
vainglorious; to bluster; to bully.
What a pleasant it is . . . to swagger at the bar!
To be great is not . . . to swagger at our footmen.