'irregularly' originates from Latin, specifically the word 'irregularis,' where 'in-' meant 'not' and 'regularis' meant 'according to rule.' 'Move' originates from Latin, specifically the word 'movere,' meaning 'to move.'

'irregularis' transformed into the Old French word 'irregulier,' and eventually became the modern English word 'irregular.' 'Movere' transformed into the Old French word 'mover,' and eventually became the modern English word 'move.'

Initially, 'irregular' meant 'not according to rule,' and 'move' meant 'to change position.' These meanings have largely remained the same in modern usage.