'suddenly-reversed' is a compound word formed from 'suddenly' and 'reversed'. 'Suddenly' originates from Middle English 'sodein', from Old French 'soudain', from Latin 'subitaneus', meaning 'unexpected'. 'Reversed' comes from Latin 'reversus', the past participle of 'revertere', meaning 'to turn back'.

'Suddenly' evolved from Middle English 'sodein' to modern English 'suddenly'. 'Reversed' evolved from Latin 'reversus' to modern English 'reversed'.

Initially, 'suddenly' meant 'unexpectedly', and 'reversed' meant 'turned back'. The compound 'suddenly-reversed' retains these meanings in modern usage.