'irregularly-shifted' originates from the combination of 'irregularly' and 'shifted', where 'irregularly' is derived from Latin 'irregularis', meaning 'not regular', and 'shifted' is from Old English 'sciftan', meaning 'to arrange'.

'irregularly' changed from Latin 'irregularis' to Middle English 'irreguler', and 'shifted' evolved from Old English 'sciftan' to the modern English 'shift'.

Initially, 'irregularly' meant 'not regular', and 'shifted' meant 'to arrange', but over time, they combined to describe something moved in a non-consistent manner.