"walk in a vain, important manner," O.E.
strutian "to stand out stiffly," from P.Gmc.
*strut- (cf. Dan.
strutte, Ger.
strotzen "to be puffed up, be swelled," Ger.
Strauß "fight"), from PIE base
*ster- "strong, firm, stiff, rigid" (see
sterile). Originally of the air or the attitude; modern sense, focused on the walk, first recorded 1518. Cognate with O.E.
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.