'strut' originates from Old English, specifically the word 'strūtian,' where 'strūt-' meant 'to swell or bulge.'

'strūtian' transformed into the Middle English word 'strouten,' and eventually became the modern English word 'strut.'

Initially, it meant 'to swell or bulge,' but over time it evolved into its current meanings of 'to walk proudly' and 'a structural support.'