1. parade, flourish. Strut and swagger refer especially to carriage in walking. Strut implies swelling pride or pompousness; to strut is to walk with a stiff, pompous, seemingly affected or self-conscious gait: A turkey struts about the barnyard.Swagger implies a domineering, sometimes jaunty, superiority or challenge, and a self-important manner: to swagger down the street.
"walk in a vain, important manner," Old English strutian "to stand out stiffly," from Proto-Germanic *strut- (cf. Danish strutte, German strotzen "to be puffed up, be swelled," German Strauß "fight"), from PIE root *ster- "strong, firm, stiff, rigid" (see sterile). Originally of the air or the attitude; modern sense, focused on the walk, first recorded 1510s. Cognate with Old English ðrutung "anger, arrogance" (see throat). To strut (one's) stuff is black slang, first recorded 1926, from strut as the name of a dance popular from c.1900.
"supporting brace," 1580s, perhaps from strut (v.), or a cognate word in Old Norse or Low German (cf. Low German strutt "rigid"); ultimately from Proto-Germanic *strutoz-, from root *strut- (see strut (v.)).
Behave or perform in an ostentatious manner, show off, as in The skaters were out, strutting their stuff. This expression uses strut in the sense of “display in order to impress others.” [Slang; first half of 1900s]