'unrestrict' originates from the prefix 'un-' meaning 'not' and the word 'restrict' from Latin 'restringere', where 're-' meant 'back' and 'stringere' meant 'to bind'.

'restrict' changed from the Latin word 'restringere' and eventually became the modern English word 'restrict'. Adding the prefix 'un-' formed 'unrestrict'.

Initially, 'restrict' meant 'to bind back', but over time it evolved into its current meaning of 'to limit'. 'Unrestrict' now means 'to remove those limits'.