'swagger' originates from the Scandinavian language, specifically the word 'svagga', where 'svagga' meant 'to sway'.

'svagga' transformed into the English word 'swagger' during the 16th century, and eventually became the modern English word 'swaggering'.

Initially, it meant 'to sway or lurch', but over time it evolved into its current meaning of 'to walk or behave in a very confident and arrogant or self-important way'.